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[Qemu-devel] Re: qemu-kvm faster than qemu?
From: |
walt |
Subject: |
[Qemu-devel] Re: qemu-kvm faster than qemu? |
Date: |
Wed, 25 Aug 2010 16:09:40 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:2.0b5pre) Gecko/20100825 Shredder/3.2a1pre |
On 08/25/2010 12:48 PM, Anthony Liguori wrote:
On 08/25/2010 02:37 PM, walt wrote:
Hi qemu team,
I just discovered that qemu now offers kvm support, so I decided to
compare it to qemu-kvm.
I'm running the latest git versions of both programs on an AMD64
host running the latest kernel from Linus.git.
The guest is Windows 7 on a qcow2 disk image and one kvm64 cpu.
I find that qemu-kvm boots to the Win7 login prompt in 25 seconds,
>> while qemu with kvm enabled takes about 45 seconds.
make sure you build qemu with --enable-io-thread.
I built qemu both with and without io-thread, and it makes no difference
at least in this particular experiment.
(BTW, I found that qemu-kvm will not even compile with --enable-io-thread
because qemu_mutex_lock_iothread becomes defined in two places.)
Also, what's your full command line?
For qemu:
/usr/local/bin/qemu-system-x86_64 -m 1024 -enable-kvm -cpu kvm64 w7.diff
For qemu-kvm:
/home/wa1ter/bin/qemu-system-x86_64 -m 1024 -enable-kvm -cpu kvm64 w7.diff
Note that w7.diff is the same file in both cases: a qcow2 differencing disk
made from the original qcow2 backing file w7.img.
Thanks for your reply. I'm curious if anyone can reproduce this difference
in speed.
- [Qemu-devel] qemu-kvm faster that qemu?, walt, 2010/08/25
- Re: [Qemu-devel] qemu-kvm faster that qemu?, Anthony Liguori, 2010/08/25
- [Qemu-devel] Re: qemu-kvm faster than qemu?,
walt <=
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Anthony Liguori, 2010/08/25
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Gerd Hoffmann, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Gleb Natapov, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Gerd Hoffmann, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Alexander Graf, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Gleb Natapov, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Avi Kivity, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Anthony Liguori, 2010/08/26
- Re: [Qemu-devel] Re: qemu-kvm faster than qemu?, Gleb Natapov, 2010/08/26
- [Qemu-devel] Re: qemu-kvm faster than qemu?, walt, 2010/08/26