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[Qemu-devel] [Bug 524447] Re: virsh save is very slow


From: Jeff Snider
Subject: [Qemu-devel] [Bug 524447] Re: virsh save is very slow
Date: Sat, 23 Jul 2011 00:36:00 -0000

Tested 0.12.3+noroms-0ubuntu9.14 on Lucid amd64 with all available
updates.  Save speed is now approx 3 seconds for a 256Mb guest.  Tested
virsh with start, stop, save, restore, suspend, resume, shutdown,
destroy.  Tested guest with smp, virtio disk, virtio net, vnc display.
Everything worked as expected.

If there's more I can do, let me know.  Thanks!

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https://bugs.launchpad.net/bugs/524447

Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
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:
  New
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
Status in “libvirt” source package in Maverick:
  New
Status in “qemu-kvm” source package in Maverick:
  In Progress

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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