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

[Serge Hallyn]

Thanks for that info.  That is unexpected.  Could you send the xml
description of the domain you were snapshotting, as well as the format
of the backing file (i.e. qemu-img info filename.img) and what
filesystem it is stored on (or whether it is LVM)?  I'd like to try to
reproduce it.

Since you are seeing this in natty, it seems certain that while your
symptom is the same as that in the original bug report, the cause is
different.  So it may be best to open a new bug report to track down the
new issue in natty.

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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:
  In Progress
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.