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

[Jeff Snider]

Ok, great!  Thanks for the quick response.  I did just now get finished
testing the packages you attached in #21 using my lucid box.  Saves of a
256Mb guest went from ~50 seconds to ~3.  So it does seem to fix the
issue.  I can set up a Maverick box if you need it tested there as well.

I checked for basic functionality with the packages you provided and the
basics seem to work, (virsh start, stop, restore, save. Guest disk, net,
vnc) but I didn't do much more.  How deep should I go testing for
regressions?

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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.

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