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1. Re: [Qemu-discuss] Slow boot in QEMU with virtio-scsi disks (score: 38)
Author: HIDDEN
Date: Sat, 11 Aug 2018 20:23:20 +0800
Please test for-4.19/block: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/log/?h=for-4.19/block This slow boot issue should have been fixed by the following commits: 1311326cf
/archive/html/qemu-discuss/2018-08/msg00035.html (8,610 bytes)

2. [Qemu-discuss] Slow boot in QEMU with virtio-scsi disks (score: 37)
Author: HIDDEN
Date: Sat, 11 Aug 2018 11:47:46 +0200
Hi. I'd like to resurrect previous discussion [1] regarding slow kernel boot inside QEMU with virtio-scsi disks attached and blk_mq enabled. Symptom: [ 2.830857] ata1: SATA max UDMA/133 abar address@
/archive/html/qemu-discuss/2018-08/msg00036.html (8,441 bytes)

3. Re: [Qemu-discuss] qemu too slow (score: 37)
Author: HIDDEN
Date: Mon, 25 Aug 2014 11:55:53 +0200
You have right. I am a long time user of qemu and in the past I was able to use it and it worked perfectly. I am pretty sure that I have not correctly built qemu or one if its dependencies. I don't k
/archive/html/qemu-discuss/2014-08/msg00056.html (7,152 bytes)

4. Migration very slow on block copy (score: 36)
Author: HIDDEN
Date: Tue, 11 Aug 2020 16:43:46 +0200
Hi, I'm doing a live migration with a non shared storage on QEMY 4.2.0. Unfortunately the block migration is terribly slow and I can't find why. It does not saturate the network link and use only in
/archive/html/qemu-discuss/2020-08/msg00011.html (8,083 bytes)

5. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Tue, 14 May 2019 13:46:59 +0200
Am 14.05.2019 um 09:36:29 schrieb Michael Fritscher: Am 13.05.2019 um 23:41:25 schrieb Michael Fritscher: On 13.05.19 23:16, Jakob Bohm wrote: On 13/05/2019 16:35, Michael Fritscher wrote: Am 13.05.2
/archive/html/qemu-discuss/2019-05/msg00016.html (12,859 bytes)

6. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Tue, 14 May 2019 09:36:29 +0200
Am 13.05.2019 um 23:41:25 schrieb Michael Fritscher: On 13.05.19 23:16, Jakob Bohm wrote: On 13/05/2019 16:35, Michael Fritscher wrote: Am 13.05.2019 um 16:10:33 schrieb Michael Fritscher:   Am Mont
/archive/html/qemu-discuss/2019-05/msg00015.html (11,959 bytes)

7. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Mon, 13 May 2019 23:41:25 +0200
The thing is, on VMWare I see no hpet_read calls, the most called function is reading from the network card - and I have _way_ more called syscalls on VMWare (30k on VMWare vs. 9k on qemu in 5 second
/archive/html/qemu-discuss/2019-05/msg00014.html (11,850 bytes)

8. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Mon, 13 May 2019 23:16:58 +0200
On 13/05/2019 16:35, Michael Fritscher wrote: Am 13.05.2019 um 16:10:33 schrieb Michael Fritscher:   Am Montag, 13. Mai 2019 15:25 CEST, Michael Fritscher <address@hidden> schrieb: Am 13.05.2019 um
/archive/html/qemu-discuss/2019-05/msg00013.html (9,277 bytes)

9. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Mon, 13 May 2019 16:35:20 +0200
Am 13.05.2019 um 16:10:33 schrieb Michael Fritscher: Am Montag, 13. Mai 2019 15:25 CEST, Michael Fritscher <address@hidden> schrieb: Am 13.05.2019 um 10:32:48 schrieb Michael Fritscher: Good day, Sce
/archive/html/qemu-discuss/2019-05/msg00012.html (9,029 bytes)

10. Re: [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 36)
Author: HIDDEN
Date: Mon, 13 May 2019 15:25:48 +0200
Am 13.05.2019 um 10:32:48 schrieb Michael Fritscher: Good day, Scenario: Host: Windows 7 and 10 64 bit, Skylake+ CPUs Qemu Version: 3.1 (4.0 isn't available yet on https://qemu.weilnetz.de/) Accelera
/archive/html/qemu-discuss/2019-05/msg00011.html (7,753 bytes)

11. Re: [Qemu-discuss] savevm too slow (score: 36)
Author: HIDDEN
Date: Mon, 9 Sep 2013 11:16:10 +0200
Am 09.09.2013 um 10:47 hat xuanmao_001 geschrieben: I sent them to you on Friday, the first email has the following subject line: [PATCH 0/2] qcow2: Discard VM state in active L1 after creating snaps
/archive/html/qemu-discuss/2013-09/msg00030.html (10,324 bytes)

12. Re: [Qemu-discuss] savevm too slow (score: 36)
Author: HIDDEN
Date: Mon, 9 Sep 2013 16:47:29 +0800
 I sent patches that should eliminate the difference between the first where I can find the patches that can eliminate the difference between the first and second snapshot ? Does they fit qemu-kvm
/archive/html/qemu-discuss/2013-09/msg00029.html (12,835 bytes)

13. [Qemu-discuss] Qemu on Windows (with haxm and whpx), minimal Ubuntu, SLIRP and OpenVPN: very slow (score: 35)
Author: HIDDEN
Date: Mon, 13 May 2019 10:32:48 +0200
Good day, Scenario: Host: Windows 7 and 10 64 bit, Skylake+ CPUs Qemu Version: 3.1 (4.0 isn't available yet on https://qemu.weilnetz.de/) Accelerators: HAXM and WHPX Guest: Ubuntu 18.04.2 64 bit, min
/archive/html/qemu-discuss/2019-05/msg00009.html (6,779 bytes)

14. [Qemu-discuss] Windows 7 slow boot (score: 35)
Author: HIDDEN
Date: Mon, 27 Feb 2017 22:20:51 -0600
I’m having a difficult time with windows 7 on my kvm/libvirt/qemu host. Booting from the ISO, the “Starting Windows” animation is very slow and it takes hours to reach the installation. The act
/archive/html/qemu-discuss/2017-02/msg00134.html (8,311 bytes)

15. Re: [Qemu-discuss] savevm too slow (score: 35)
Author: HIDDEN
Date: Mon, 9 Sep 2013 10:35:22 +0200
Am 09.09.2013 um 03:57 hat xuanmao_001 geschrieben: No. Using a larger buffer size should be safe. Kevin
/archive/html/qemu-discuss/2013-09/msg00028.html (8,468 bytes)

16. Re: [Qemu-discuss] savevm too slow (score: 35)
Author: HIDDEN
Date: Mon, 9 Sep 2013 09:57:39 +0800
Juan, any specific reason for using 32k? I think it would be better to have a multiple of the qcow2 cluster size, otherwise we get COW for the empty part of newly allocated clusters. If we can't mak
/archive/html/qemu-discuss/2013-09/msg00024.html (10,655 bytes)

17. [Qemu-discuss] How to emulate a slow 4core computer (score: 35)
Author: HIDDEN
Date: Wed, 13 Mar 2013 10:12:38 +0330
Hi. i want to emulate a slow 4core computer and install xp in it and i need to use internet in that. which commadn i must write. thank. cpu help show: x86           phenom  AMD Phenom(tm)
/archive/html/qemu-discuss/2013-03/msg00009.html (4,374 bytes)

18. [Qemu-discuss] qemu for windows is too slow (score: 35)
Author: HIDDEN
Date: Mon, 3 Dec 2012 19:15:45 +0800
Hi all:     I have try the qemu release from 0.9  to 0.14 and feel that they are so slow that I can not tolerant, though I made the kqemu module worked together. Compare to the virtualbox the qem
/archive/html/qemu-discuss/2012-12/msg00001.html (4,217 bytes)

19. [Qemu-discuss] Very slow HD-access (score: 35)
Author: HIDDEN
Date: Wed, 29 Feb 2012 16:20:42 +0100
Hi folks! I'm trying to set up a Windows 7 VM ( alternatively XP ). Everything works fine except of the hard drive access, it's very slow. It doesn't matter if i use the virtio drivers or not. The R/
/archive/html/qemu-discuss/2012-02/msg00046.html (4,176 bytes)

20. Re: Windows 10 host SLOW (score: 34)
Author: HIDDEN
Date: Tue, 28 Jul 2020 09:50:11 +0200
-enable-kvm Narcis Garcia El 28/7/20 a les 2:34, Jerry Geis ha escrit:
/archive/html/qemu-discuss/2020-07/msg00069.html (4,377 bytes)

21. Windows 10 host SLOW (score: 34)
Author: HIDDEN
Date: Mon, 27 Jul 2020 20:34:23 -0400
I am running Windwos 10 host and latest qemu. I have tried to run with and without the -accel whpx flags.  operation is the same SLOW. even though it ways windows acceleration enabled. Is there an
/archive/html/qemu-discuss/2020-07/msg00067.html (4,000 bytes)

22. Re: [Qemu-discuss] Slow boot in QEMU with virtio-scsi disks (score: 34)
Author: HIDDEN
Date: Wed, 22 Aug 2018 12:15:23 +0200
So do I. Thanks Ming Lei for the fix ! Cheers, -- Greg
/archive/html/qemu-discuss/2018-08/msg00089.html (5,777 bytes)

23. Re: [Qemu-discuss] Slow boot in QEMU with virtio-scsi disks (score: 34)
Author: HIDDEN
Date: Sat, 11 Aug 2018 19:39:56 +0200
Hi. https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/log/?h=for-4.19/block This slow boot issue should have been fixed by the following commits: 1311326cf475 blk-mq: avoid to syn
/archive/html/qemu-discuss/2018-08/msg00038.html (5,579 bytes)

24. Re: [Qemu-discuss] Qemu on windows host is slow (score: 34)
Author: HIDDEN
Date: Fri, 10 Nov 2017 12:59:53 +0100
If you're using the latest and greatest version of QEMU, you can have a try with "--accel hax" on Windows. Thomas
/archive/html/qemu-discuss/2017-11/msg00017.html (4,767 bytes)

25. [Qemu-discuss] Qemu on windows host is slow (score: 34)
Author: HIDDEN
Date: Fri, 10 Nov 2017 11:19:56 +0330
Hi, I have installed qemu on my windows 10 (x64) and I am able to run qemu-system-x86_64 command. Problem is that it is very slow! And when I want to install an Ubuntu as a guest, I have to wait many
/archive/html/qemu-discuss/2017-11/msg00016.html (4,331 bytes)

26. [Qemu-discuss] ASan'ed binaries start up very slow under qemu-aarch64. (score: 34)
Author: HIDDEN
Date: Mon, 18 Jul 2016 17:45:15 +0300
Hi! When testing AddressSanitizer tool for AArch64 under qemu-aarch64 (user mode), I found out that even trivial helloworld apps start extremely slow (~2 seconds). I've investigated this a bit and no
/archive/html/qemu-discuss/2016-07/msg00026.html (6,376 bytes)

27. [Qemu-discuss] Slow read IO with a 9P virtio fs (score: 34)
Author: HIDDEN
Date: Fri, 24 Jun 2016 18:44:04 +1200
I've encountered slow IO (~25MB/s reading from a 100MB file) with both a MIPS and an i386 qemu vm, on an x86_64 host. The system generally sits at around 30% CPU during this operation (dd if=/bigfile
/archive/html/qemu-discuss/2016-06/msg00046.html (4,946 bytes)

28. [Qemu-discuss] Why are qcow2 internal snapshots (savevm and otherwise) still so slow (score: 34)
Author: HIDDEN
Date: Mon, 03 Nov 2014 16:49:26 +0100
This is just a burp of frustration, after years of running qemu+kvm. I am currently running qemu-system version 2.1.0 (Debian package 2.1+dfsg-2~bpo70+2), and after several years of ongoing bug repor
/archive/html/qemu-discuss/2014-11/msg00005.html (7,448 bytes)

29. Re: [Qemu-discuss] qemu too slow (score: 34)
Author: HIDDEN
Date: Mon, 25 Aug 2014 17:18:30 +0200
What I see is: $ lsmod | grep kvm kvm_intel 125247 0 kvm 338101 1 kvm_intel
/archive/html/qemu-discuss/2014-08/msg00058.html (7,335 bytes)

30. Re: [Qemu-discuss] qemu too slow (score: 34)
Author: HIDDEN
Date: Mon, 25 Aug 2014 07:43:56 -0400
Have you verified that the kernel module for KVM is installed? $ lsmod | grep -i kvm IIRC should show "kvm-hv" or "kvm-pr" If you see nothing, then become root and do this: or --BEGIN PGP SIGNATURE--
/archive/html/qemu-discuss/2014-08/msg00057.html (6,612 bytes)

31. [Qemu-discuss] qemu too slow (score: 34)
Author: HIDDEN
Date: Mon, 25 Aug 2014 06:27:12 +0200
Hello, I am using qemu-2.1.0 on a Slackware 14.1 operating system (with Linux 3.15.8). I run qemu like this: $ qemu-img create /tmp/qemu-img 5G $ sudo qemu-system-i386 -boot order=d -hda /tmp/qemu-im
/archive/html/qemu-discuss/2014-08/msg00055.html (5,104 bytes)

32. Re: [Qemu-discuss] Guest network performance is painfully slow (score: 34)
Author: HIDDEN
Date: Mon, 18 Aug 2014 09:07:34 -0400
Why are you using e1000 and not virtio?  The virtio drives have significantly better performance.... Ubuntu should also have native support for them. On 8/17/2014 10:34 PM, JHM wrote: Salutations to
/archive/html/qemu-discuss/2014-08/msg00047.html (8,678 bytes)

33. Re: [Qemu-discuss] Guest network performance is painfully slow (score: 34)
Author: HIDDEN
Date: Mon, 18 Aug 2014 08:48:49 +0100
No, Julio is correct. The KVM functionality was all merged into upstream QEMU, and the separate qemu-kvm project is now dead. If your qemu-kvm binary is not just a wrapper script that runs qemu then
/archive/html/qemu-discuss/2014-08/msg00044.html (6,130 bytes)

34. Re: [Qemu-discuss] Guest network performance is painfully slow (score: 34)
Author: HIDDEN
Date: Sun, 17 Aug 2014 23:09:49 -0700
Unless someone says differently, I believe that doesn't change the likely fact that the main KVM is different than what you are doing and would perform much better. Tony
/archive/html/qemu-discuss/2014-08/msg00043.html (9,203 bytes)

35. [Qemu-discuss] Guest network performance is painfully slow (score: 34)
Author: HIDDEN
Date: Sun, 17 Aug 2014 23:34:00 -0300
Salutations to all members, first off. This is my first post in the discussion group. I searched for this topic, but not much turned up from the archive here. Searching for "slow" http://lists.nongnu
/archive/html/qemu-discuss/2014-08/msg00042.html (7,361 bytes)

36. Re: [Qemu-discuss] savevm too slow (score: 34)
Author: HIDDEN
Date: Fri, 6 Sep 2013 12:38:37 +0200
Am 06.09.2013 um 03:31 hat xuanmao_001 geschrieben: I sent patches that should eliminate the difference between the first and second snapshot at least. cache=unsafe ignores any flush requests. It's p
/archive/html/qemu-discuss/2013-09/msg00019.html (6,497 bytes)

37. [Qemu-discuss] savevm too slow (score: 34)
Author: HIDDEN
Date: Fri, 6 Sep 2013 09:31:20 +0800
Hi, qemuers: I found that the guest disk file cache mode will affect to the time of savevm. the cache 'writeback' too slow. but the cache 'unsafe' is as fast as it can, less than 10 seconds. here is
/archive/html/qemu-discuss/2013-09/msg00018.html (6,290 bytes)

38. [Qemu-discuss] Windows Server 2008 R2 slow printing (score: 34)
Author: HIDDEN
Date: Fri, 19 Apr 2013 12:40:39 +1200
Just wanted to capture this... I have a QEMU host running a mix of Linux and Windows virtual machines. The Windows Server 2008 R2 virtual machines had became very slow to print. It was taking up to 2
/archive/html/qemu-discuss/2013-04/msg00045.html (5,094 bytes)

39. Re: [Qemu-discuss] Running several ARM VMs with a multicast-based VLAN results in extremely slow forwarded connections (score: 34)
Author: HIDDEN
Date: Wed, 03 Oct 2012 10:19:22 -0600
I'm using a script like this: qemu-system-arm \ -machine versatilepb \ -kernel vmlinuz-3.2.0-3-versatile \ -hda hda$1.img \ -initrd initrd.img-3.2.0-3-versatile \ -append "root=/dev/sda1" \ -m 640 \
/archive/html/qemu-discuss/2012-10/msg00003.html (8,078 bytes)

40. [Qemu-discuss] Running several ARM VMs with a multicast-based VLAN results in extremely slow forwarded connections (score: 34)
Author: HIDDEN
Date: Wed, 3 Oct 2012 08:24:49 +0200
Hi folks, I'm using a script like this: qemu-system-arm \ -machine versatilepb \ -kernel vmlinuz-3.2.0-3-versatile \ -hda hda$1.img \ -initrd initrd.img-3.2.0-3-versatile \ -append "root=/dev/sda1" \
/archive/html/qemu-discuss/2012-10/msg00002.html (5,983 bytes)

41. Re: Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Wed, 20 Jan 2021 06:50:36 -0800
/archive/html/qemu-discuss/2021-01/msg00043.html (6,420 bytes)

42. Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Tue, 19 Jan 2021 23:07:40 -0800
I am a novice using qemu to run LUbuntu in a Mac osx host. I used this guide https://graspingtech.com/ubuntu-desktop-18.04-virtual-machine-macos-qemu/ Using this I can run the LUbuntu VM. However, if
/archive/html/qemu-discuss/2021-01/msg00042.html (4,951 bytes)

43. Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Wed, 20 Jan 2021 06:17:05 -0800
Trying to figure out how to reply to a thread
/archive/html/qemu-discuss/2021-01/msg00041.html (4,052 bytes)

44. Re: Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Wed, 20 Jan 2021 02:01:47 -0800
I think what they're observing, and I may be wrong, is that either their desktop environment, or Qemu, or their OS, is de-prioritizing Qemu when it loses foreground focus, and causing it to see timer
/archive/html/qemu-discuss/2021-01/msg00040.html (6,043 bytes)

45. Re: Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Wed, 20 Jan 2021 09:28:56 +0100
I am a novice like yourself ... Can it be that the guest OS is going to "hibernate" or "suspend" or so automatically after a defined period of inactivity and you just misinterpret this as kvm/qemu be
/archive/html/qemu-discuss/2021-01/msg00039.html (5,579 bytes)

46. Minimizing qemu causes it to slow down (score: 33)
Author: HIDDEN
Date: Tue, 19 Jan 2021 23:20:22 -0800
I am a novice using qemu to run LUbuntu in a Mac osx host. I used this guide https://graspingtech.com/ubuntu-desktop-18.04-virtual-machine-macos-qemu/ Using this I can run the LUbuntu VM. However, if
/archive/html/qemu-discuss/2021-01/msg00038.html (4,338 bytes)

47. Virtual hard disks slow to back up because they are single big files (score: 33)
Author: HIDDEN
Date: Thu, 24 Dec 2020 12:46:15 +0100
Hi all: I have written a Bash script to stop and back up my libvirt/KVM/QEMU virtual machine every night: https://github.com/rdiez/Tools/blob/master/VirtualMachineManager/BackupVm.sh There are ways t
/archive/html/qemu-discuss/2020-12/msg00039.html (6,249 bytes)

48. Re: Windows 10 host SLOW (score: 33)
Author: HIDDEN
Date: Tue, 28 Jul 2020 09:40:05 +0100
kvm won't work on a Windows host. -- Ottavio Caruso A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most a
/archive/html/qemu-discuss/2020-07/msg00070.html (4,251 bytes)

49. Re: [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Wed, 1 Aug 2018 10:59:40 +0300
I try 'qemu-kvm-ev-2.10.0-21.el7_5.4.1.x86_64'. And open bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1610461
/archive/html/qemu-discuss/2018-08/msg00000.html (4,866 bytes)

50. Re: [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Tue, 31 Jul 2018 13:46:41 +0300
2018-07-31 13:35, utdilya rašė: Thank you. This is solution not working for me. Maybe, because of Centos7. I have in the log: 3707 : host doesn't support hyperv 'relaxed' feature 3707 : host doesn'
/archive/html/qemu-discuss/2018-07/msg00069.html (5,652 bytes)

51. Re: [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Tue, 31 Jul 2018 13:35:59 +0300
Thank you. This is solution not working for me. Maybe, because of Centos7. I have in the log: 3707 : host doesn't support hyperv 'relaxed' feature 3707 : host doesn't support hyperv 'vapic' feature 3
/archive/html/qemu-discuss/2018-07/msg00068.html (12,795 bytes)

52. Re: [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Tue, 31 Jul 2018 13:10:53 +0300
Hello. I have this problem too, on Centos7 with qemu.kvm on the 4 different machines. Tell me please, do you have resolved this problem? My windows 10 after upgrades to 1803 has too much interrupts m
/archive/html/qemu-discuss/2018-07/msg00067.html (10,411 bytes)

53. Re: [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Tue, 31 Jul 2018 02:11:04 -0700 (MST)
Hello. I have this problem too, on Centos7 with qemu.kvm on the 4 different machines. Tell me please, do you have resolved this problem? My windows 10 after upgrades to 1803 has too much interrupts m
/archive/html/qemu-discuss/2018-07/msg00066.html (4,433 bytes)

54. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Fri, 13 Jul 2018 19:03:09 +0200
Bisect led me to this commit, merged in 4.16: scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity Since commit 84676c1f21e8ff5 ("genirq/affinity: assign vectors to all possible CPU
/archive/html/qemu-discuss/2018-07/msg00037.html (7,831 bytes)

55. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Thu, 12 Jul 2018 13:47:52 +0800
While there is no delay with stable 4.7.15 kernel, there is a delay less than 8 seconds with ubuntu ppa kernel 4.7.15 on amd64. Perhaps this is related to kernel config file, as I used "make defconfi
/archive/html/qemu-discuss/2018-07/msg00031.html (10,386 bytes)

56. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Thu, 12 Jul 2018 13:35:18 +0800
Hi Chris, I did not observe any delay with stable 4.17.5 on ubuntu 18.04 (I built the kernel myself with CONFIG_SCSI_VIRTIO=y): file=/home/zhang/img/ubuntu1804.qcow2,format=qcow2,if=none,id=virt1 -de
/archive/html/qemu-discuss/2018-07/msg00030.html (8,037 bytes)

57. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Wed, 11 Jul 2018 13:45:09 -0400
Interesting. I just tried kernel 4.17.5 from the mainline ppa on Ubuntu 18.04 and now there is a delay. It's only 7.5 seconds but still noticeable. There was previously no delay with the 4.15 kernel.
/archive/html/qemu-discuss/2018-07/msg00029.html (6,158 bytes)

58. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Wed, 11 Jul 2018 18:43:05 +0200
I've been observing a similar delay on ppc64 with fedora28 guests: [ 1.530946] scsi host0: Virtio SCSI HBA [ 1.532452] scsi 0:0:0:0: Direct-Access QEMU QEMU HARDDISK 2.5+ PQ: 0 ANSI: 5 [ 21.928378] s
/archive/html/qemu-discuss/2018-07/msg00028.html (7,444 bytes)

59. Re: [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Wed, 11 Jul 2018 09:59:03 +0800
Maybe it's the same things as: http://patchwork.ozlabs.org/cover/942074/ ? Fam
/archive/html/qemu-discuss/2018-07/msg00023.html (6,346 bytes)

60. [Qemu-discuss] virtio-scsi really slow init with ArchLinux kernel (score: 33)
Author: HIDDEN
Date: Tue, 10 Jul 2018 08:53:00 -0400
I'm getting a 15 second delay on every VM boot when using the ArchLinux kernel and using the virtio-scsi-pci system. QEMU emulator version 2.12.0 running on Arch Linux (4.17.4 kernel), booting the sa
/archive/html/qemu-discuss/2018-07/msg00022.html (5,280 bytes)

61. [Qemu-discuss] High host CPU load and slow Windows 10 vm after upgrade to 1803 (score: 33)
Author: HIDDEN
Date: Sun, 10 Jun 2018 21:38:37 +0200
Hi to all, I'm new in this ML. After upgrading some VM from Windows 10 1709 to Windows 10 1803, the VMs runs slower. And when VM is almost idle, host CPU load is quite high. It happens on 4 different
/archive/html/qemu-discuss/2018-06/msg00011.html (9,340 bytes)

62. Re: [Qemu-discuss] ASan'ed binaries start up very slow under qemu-aarch64. (score: 33)
Author: HIDDEN
Date: Tue, 19 Jul 2016 10:49:39 +0100
I mean *guest* pages. We need to detect self-modifying guest code, and the guest could do that for any page in its virtual address space. thanks -- PMM
/archive/html/qemu-discuss/2016-07/msg00034.html (5,857 bytes)

63. Re: [Qemu-discuss] ASan'ed binaries start up very slow under qemu-aarch64. (score: 33)
Author: HIDDEN
Date: Tue, 19 Jul 2016 12:22:41 +0300
Peter, thank you for your answer. 2) In QEMU, page_set_flags is called for these ranges. It cuts given range to individual pages and sets flags for them. Given the page size is 4 Kb, for 8 Gb range w
/archive/html/qemu-discuss/2016-07/msg00033.html (8,301 bytes)

64. Re: [Qemu-discuss] ASan'ed binaries start up very slow under qemu-aarch64. (score: 33)
Author: HIDDEN
Date: Mon, 18 Jul 2016 16:51:21 +0100
(CCing qemu-devel, which is more likely to get developer attention) Mmm, the algorithm here is pretty simple and basically assumes the guest isn't going to be doing enormous allocations like that. (I
/archive/html/qemu-discuss/2016-07/msg00027.html (6,712 bytes)

65. Re: [Qemu-discuss] Guest network performance is painfully slow (score: 33)
Author: HIDDEN
Date: Tue, 19 Aug 2014 21:29:19 -0700
Cool. If the merge really has completed, that's good to know. Tony
/archive/html/qemu-discuss/2014-08/msg00053.html (6,723 bytes)

66. Re: [Qemu-discuss] slow qemu openbsd (score: 33)
Author: HIDDEN
Date: Mon, 26 May 2014 23:35:55 +0530
Does your CPU support hardware virtualization? If yes, then try adding --enable-kvm (assuming your host OS is linux and has the KVM module). On Mon, May 26, 2014 at 8:31 PM, Швецов Михаил
/archive/html/qemu-discuss/2014-05/msg00028.html (5,582 bytes)

67. [Qemu-discuss] slow qemu openbsd (score: 33)
Author: HIDDEN
Date: Mon, 26 May 2014 19:01:01 +0400
Maybe I'm doing something wrong. Please help me. I install openbsd 5.5 i386 and qemu-1.7.0 from packages. qemu-img create -f qcow2 /vm/qcow2.img 10G qemu-system-i386 -name qcow2 -nodefaults -m 512 -h
/archive/html/qemu-discuss/2014-05/msg00027.html (5,250 bytes)

68. [Qemu-discuss] Could large volume of uncoalesced memory regions slow down kvm and qemu? (score: 33)
Author: HIDDEN
Date: Mon, 28 Jan 2013 18:09:02 +0800
List: I am currently trying to figure out how to map coalesced guest virtual address (gva) space onto host virtual address (hva) space. One of my thoughts is to allocate memory, then assign them as f
/archive/html/qemu-discuss/2013-01/msg00061.html (4,563 bytes)

69. [Qemu-discuss] QEMU becomes very slow with -nographic option (score: 33)
Author: HIDDEN
Date: Sun, 18 Nov 2012 18:32:25 -0800
Hi, when I run qemu remotely using -nographic option, the emulation becomes surprisingly slower than using graphic mode. I am very confused because the emulation speed should have nothing to do with
/archive/html/qemu-discuss/2012-11/msg00016.html (4,203 bytes)

70. Re: qemu-img measure (score: 5)
Author: HIDDEN
Date: Tue, 28 Jul 2020 22:30:47 +0200
Proposed alternative implementation techniques: A. Check if the block count returned by stat is less than what the apparent file size (elsewhere in the stat structure) suggests. B. When converting fr
/archive/html/qemu-discuss/2020-07/msg00076.html (9,416 bytes)

71. Re: qemu-img measure (score: 5)
Author: HIDDEN
Date: Mon, 27 Jul 2020 01:08:48 +0300
qemu-img measure checks that allocation status of blocks. As Nir said, if the file system (older NFS versions) doesn't support that then it doesn't know about zero blocks. It would be possible to ad
/archive/html/qemu-discuss/2020-07/msg00060.html (6,722 bytes)

72. Re: AARCH64 sve and sve2 instruction emulation not calling plugin memory op (score: 4)
Author: HIDDEN
Date: Wed, 9 Dec 2020 11:57:54 -0600
The softmmu version will also go through memset, usually. See mem = probe_write(env, vaddr, blocklen, mmu_idx, ra); where we only take the slow path if we can't resolve the virtual address to RAM (an
/archive/html/qemu-discuss/2020-12/msg00017.html (6,575 bytes)

73. Re: [Qemu-discuss] How to resolve "Failed to mmap" error? (score: 4)
Author: HIDDEN
Date: Mon, 10 Oct 2016 20:05:02 -0700
I just tried testing the patch. Initially, it seemed to work fine (log messages below). However, I am getting hard lockup of the host machine shortly after the vfio_region_setup related log lines pri
/archive/html/qemu-discuss/2016-10/msg00035.html (27,390 bytes)

74. Re: [Qemu-discuss] How to resolve "Failed to mmap" error? (score: 4)
Author: HIDDEN
Date: Fri, 7 Oct 2016 10:23:07 -0600
Hi Andrew, Would it be possible for you to test the patch below? I'd be happy to add Reported-by and Tested-by credits to the patch if you can provide your real name (and preferred email if other tha
/archive/html/qemu-discuss/2016-10/msg00023.html (21,057 bytes)

75. Re: spin loop 100x faster in user mode (CPL=3) than superuser (CPL=0)? (score: 3)
Author: HIDDEN
Date: Fri, 29 Oct 2021 12:06:09 -0700
/archive/html/qemu-discuss/2021-10/msg00049.html (7,302 bytes)

76. spin loop 100x faster in user mode (CPL=3) than superuser (CPL=0)? (score: 3)
Author: HIDDEN
Date: Tue, 19 Oct 2021 15:05:56 -0700
Hello I have a mystery I haven't been able to run down and would appreciate any explanation or advice. On a mac/intel I am running qemu-system-x86_64 on a simple image which bootstraps into 64 bit lo
/archive/html/qemu-discuss/2021-10/msg00039.html (5,673 bytes)

77. Re: how to improve qcow performance? (score: 3)
Author: HIDDEN
Date: Wed, 21 Jul 2021 16:37:40 +0300
QCOW3 is qcow2 v3. There is a version field in the format, but for some reason it is not exposed in qemu-img info. You can inspect the headers with this minimal qcow2 parser: https://github.com/nirs/
/archive/html/qemu-discuss/2021-07/msg00108.html (12,054 bytes)

78. Re: how to improve qcow performance? (score: 3)
Author: HIDDEN
Date: Wed, 21 Jul 2021 14:20:10 +0200
Dear Nir/Friends, I read here [1] there was a qcow3, but it seems that page is deprecated (last update on sept. 2016) I see! Now I get it I mean, by reducing the size of a qcow image and distribute t
/archive/html/qemu-discuss/2021-07/msg00106.html (10,074 bytes)

79. Re: AARCH64 sve and sve2 instruction emulation not calling plugin memory op (score: 3)
Author: HIDDEN
Date: Thu, 10 Dec 2020 03:30:20 +0100
Have you considered repurposing whatever plugin interface is used for x86 I/O port space?  (By defining it for each architecture without a predefined mapping to PCI bus I/O port space). On 2020-12-0
/archive/html/qemu-discuss/2020-12/msg00018.html (7,148 bytes)

80. Re: AARCH64 sve and sve2 instruction emulation not calling plugin memory op (score: 3)
Author: HIDDEN
Date: Wed, 9 Dec 2020 07:58:00 -0600
... Nope, nor for most any other out-of-line memory operation performed by any other qemu target. Starting with arm's own dc zva. The plugin interface needs extension for this. How should I signal th
/archive/html/qemu-discuss/2020-12/msg00015.html (5,416 bytes)

81. Re: qemu-img measure (score: 3)
Author: HIDDEN
Date: Fri, 24 Jul 2020 15:00:10 +0100
It would be possible to add a slow loop that reads the entire input image but I'm not sure how useful it would be to read many gigabytes of data from the disk. The process would be slow and degrade p
/archive/html/qemu-discuss/2020-07/msg00057.html (5,366 bytes)

82. Re: Exporting qcow2 images as raw data from ova file with qemu-nbd (score: 3)
Author: HIDDEN
Date: Fri, 26 Jun 2020 21:47:24 +0300
These are the patches (in review) implementing this in imageio client: - https://gerrit.ovirt.org/c/109847 - https://gerrit.ovirt.org/c/109848 And this is example script for the engine SDK: https://g
/archive/html/qemu-discuss/2020-06/msg00072.html (13,176 bytes)

83. Re: Help (score: 3)
Author: HIDDEN
Date: Fri, 28 Feb 2020 10:06:59 -0600
Note that trying to run:  * a modern-ish graphical OS like Windows  * using pure emulation (since it's x86-on-arm, not x86-on-x86)  * on a fairly slow host CPU like the Raspberry Pi series is pro
/archive/html/qemu-discuss/2020-02/msg00050.html (7,074 bytes)

84. Re: Help (score: 3)
Author: HIDDEN
Date: Fri, 28 Feb 2020 10:03:08 -0600
Note that trying to run:  * a modern-ish graphical OS like Windows  * using pure emulation (since it's x86-on-arm, not x86-on-x86)  * on a fairly slow host CPU like the Raspberry Pi series is pro
/archive/html/qemu-discuss/2020-02/msg00049.html (6,359 bytes)

85. Re: Help (score: 3)
Author: HIDDEN
Date: Fri, 28 Feb 2020 10:18:44 +0000
Note that trying to run: * a modern-ish graphical OS like Windows * using pure emulation (since it's x86-on-arm, not x86-on-x86) * on a fairly slow host CPU like the Raspberry Pi series is probably g
/archive/html/qemu-discuss/2020-02/msg00046.html (5,239 bytes)

86. Re: [RFC PATCH] configure: deprecate 32 bit build hosts (score: 3)
Author: HIDDEN
Date: Fri, 27 Sep 2019 10:55:46 +0200
Hi, Played with system emulation a while back. I doubt this is used much in practice. It's very slow for various reasons (no gic, no armv8 arch updates to support kvm virt better, slow sdcard/usb I/O
/archive/html/qemu-discuss/2019-09/msg00104.html (7,250 bytes)

87. Re: [Qemu-discuss] [kubevirt-dev] Re: Converting qcow2 image on the fly to raw format (score: 3)
Author: HIDDEN
Date: Thu, 19 Jul 2018 21:39:35 +0100
I did the original work using AFL to fuzz qemu-img and find problematic images. From that work Dan & I suggested some fairly low limits (10 seconds IIRC). See: https://bugs.launchpad.net/qemu/+bug/14
/archive/html/qemu-discuss/2018-07/msg00053.html (9,922 bytes)

88. Re: [Qemu-discuss] ppc and icount (score: 3)
Author: HIDDEN
Date: Wed, 10 Jan 2018 11:27:32 -0500
I removed the commit that caused the icount related error and continued to run. What I'm observing is that I have modified the serial.c file to have a timer to set a delay between transmit of charact
/archive/html/qemu-discuss/2018-01/msg00015.html (6,370 bytes)

89. Re: [Qemu-discuss] performances of qemu 2.10.0 (score: 3)
Author: HIDDEN
Date: Thu, 28 Sep 2017 07:27:36 +0200
Thank you, I try that. As i ma new to building qemu, I had strictly followed the wiki... Am 27.09.2017 um 22:49 schrieb Pierre Couderc: I have compiled and built from git qemu tag 2.10.0 (./configure
/archive/html/qemu-discuss/2017-09/msg00066.html (5,562 bytes)

90. Re: [Qemu-discuss] performances of qemu 2.10.0 (score: 3)
Author: HIDDEN
Date: Thu, 28 Sep 2017 05:03:39 +0200
that all software debug builds are by default extremely slow, try a release build Am 27.09.2017 um 22:49 schrieb Pierre Couderc: I have compiled and built from git qemu tag 2.10.0 (./configure --targ
/archive/html/qemu-discuss/2017-09/msg00064.html (5,160 bytes)

91. Re: [Qemu-discuss] How to resolve "Failed to mmap" error? (score: 3)
Author: HIDDEN
Date: Thu, 6 Oct 2016 23:19:13 -0700
Ah, overall bad news for me, as I now have absolutely no clue what's causing my USB performance/reliability issues in the VM :( Nonetheless, here is the new log output: address@hidden:vfio_region_set
/archive/html/qemu-discuss/2016-10/msg00022.html (15,331 bytes)

92. Re: [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Thu, 5 May 2016 09:53:40 +0200
The code reported below with KVM needs 60 minutes to complete aganist 4 minutes without. I just wondering if with KVM enabled is possible to match the performance of simple Qemu. #include "lib/lib.h"
/archive/html/qemu-discuss/2016-05/msg00019.html (14,030 bytes)

93. [Qemu-discuss] 回覆: USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Thu, 5 May 2016 07:40:33 +0000
What is your expecting performance? Vga of stdvga and cirrus are all software renderer, and their IO addresses were all emulated by virtual memory (i.e. mmap). The doubled R/W access time seems be re
/archive/html/qemu-discuss/2016-05/msg00018.html (12,506 bytes)

94. Re: [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Wed, 4 May 2016 22:47:25 +0200
I tried to launch Qemu with Vga set to cirrus,std and vmware. Same bad numbers. Is my only option to patch Qemu + KVM? I also noted some slowdown in my ata custom driver. The driver currently support
/archive/html/qemu-discuss/2016-05/msg00016.html (11,713 bytes)

95. Re: [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Wed, 4 May 2016 22:44:16 +0200
I tried to launch Qemu with Vga set to cirrus,std and vmware. Same bad numbers. Is my only option to patch Qemu + KVM? I also noted some slowdown in my ata custom driver. The driver currently support
/archive/html/qemu-discuss/2016-05/msg00015.html (10,646 bytes)

96. Re: [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Wed, 4 May 2016 22:39:07 +0200
I tried to launch Qemu with Vga set to cirrus,std and vmware. Same bad numbers. Is my only option to patch Qemu + KVM? I also noted some slowdown in my ata custom driver. The driver currently support
/archive/html/qemu-discuss/2016-05/msg00014.html (10,852 bytes)

97. Re: [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Wed, 4 May 2016 11:23:35 +0200
On 04/05/2016 10:50, giuseppe maugeri wrote: Hi, i'm developing a custom kernel for x86 platform.So Far i used as virtual environment Simics. Recently i decided to move to Qemu. Running my kernel on
/archive/html/qemu-discuss/2016-05/msg00010.html (10,206 bytes)

98. [Qemu-discuss] USE QEMU + KVM TO RUN CUSTOM KERNEL (score: 3)
Author: HIDDEN
Date: Wed, 4 May 2016 10:50:47 +0200
Hi, i'm developing a custom kernel for x86 platform.So Far i used as virtual environment Simics. Recently i decided to move to Qemu. Running my kernel on Qemu I found it tremendously slow even with K
/archive/html/qemu-discuss/2016-05/msg00008.html (6,782 bytes)

99. Re: [Qemu-discuss] Multiple Guest performance issue (score: 3)
Author: HIDDEN
Date: Mon, 15 Oct 2012 22:06:23 -0500
Found it... ARP routing problem that just made the machines feel slow. Each guest was using an identical internal mac address on its tap device. I override each in the network started file and all is
/archive/html/qemu-discuss/2012-10/msg00032.html (7,821 bytes)

100. Re: Unpredictable performance degradation in QEMU KVMs (score: 2)
Author: HIDDEN
Date: Thu, 07 Oct 2021 08:12:07 +0200
A couple more points: How many CPU's (sockets) does your motherboard have? Multi-socket machines are more or less in the NUMA territory. Suboptimal process scheduling / memory allocation "decisions"
/archive/html/qemu-discuss/2021-10/msg00013.html (9,687 bytes)


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