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[Qemu-devel] [Bug 524447] Re: virsh save is very slow
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow |
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Sat, 28 Oct 2017 00:22:57 -0000 |
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On 2010-06-02T16:38:36+00:00 Cole wrote:
See https://bugs.launchpad.net/ubuntu/+source/qemu-
kvm/+bug/524447/comments/5
Apparently increasing the dd block size greatly increases the speed of
the domain save operation.
Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/comments/6
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On 2010-06-07T17:56:00+00:00 Laine wrote:
commit 20206a4bc9f1293c69eca79290a55a5fa19976d5 in libvirt git changes
the dd blocksize to 1M. This decreased the time required for a save of a
suspended 512MB guest from 3min47sec to 56sec.
Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/comments/8
------------------------------------------------------------------------
On 2010-06-10T12:19:33+00:00 Eric wrote:
An additional patch avoids the overhead of seeking to a 1M alignment:
https://www.redhat.com/archives/libvir-list/2010-June/msg00239.html
Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/comments/9
------------------------------------------------------------------------
On 2010-07-21T16:48:55+00:00 Daniel wrote:
This is included in 0.8.2. In addition upstream QEMU has identified &
fixed a flaw that had significant speed impact
Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/comments/15
** Changed in: libvirt
Status: Unknown => Fix Released
** Changed in: libvirt
Importance: Unknown => Medium
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https://bugs.launchpad.net/bugs/524447
Title:
virsh save is very slow
Status in libvirt:
Fix Released
Status in QEMU:
Fix Released
Status in libvirt package in Ubuntu:
Invalid
Status in qemu-kvm package in Ubuntu:
Fix Released
Status in libvirt source package in Lucid:
Won't Fix
Status in qemu-kvm source package in Lucid:
Fix Released
Status in libvirt source package in Maverick:
Won't Fix
Status in qemu-kvm source package in Maverick:
Won't Fix
Status in qemu-kvm package in Debian:
Fix Released
Bug description:
==================================
SRU Justification:
1. impact: 'qemu save' is slow
2. how addressed: a patch upstream fixes the case when a file does not
announce when it is ready.
3. patch: see the patch in linked bzr trees
4. TEST CASE: see comment #4 for a specific recipe
5. regression potential: this patch only touches the vm save path.
==================================
As reported here: http://www.redhat.com/archives/libvir-
list/2009-December/msg00203.html
"virsh save" is very slow - it writes the image at around 1MB/sec on
my test system.
(I think I saw a bug report for this issue on Fedora's bugzilla, but I
can't find it now...)
Confirmed under Karmic.
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