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

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

[Anthony Liguori]

I can reproduce with:

x86_64-softmmu/qemu-system-x86_64 -hda ~/images/linux.img -snapshot -m 4G -monitor stdio -enable-kvm
QEMU 0.12.50 monitor - type 'help' for more information
(qemu) migrate_set_speed 1G
(qemu) migrate -d "exec:dd of=foo.img"

On:

commit d9b73e47a3d596c5b33802597ec5bd91ef3348e2
Author: Corentin Chary <corentincj@iksaif.net>
Date:   Tue Jun 1 23:05:44 2010 +0200

    vnc: add missing target for vnc-encodings-*.o


Even though the rate limit is set at 1G, we're not getting more than 1-2MB/s of migration traffic.

** Changed in: qemu
       Status: New => Confirmed

** Changed in: qemu
     Assignee: (unassigned) => Anthony Liguori (anthony-codemonkey)

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
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Status in QEMU: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Anthony Liguori]

This actually turns out to be related to dd's default block size.  By
default, dd uses a block size of 512.  The effect of this is that qemu
fills the pipe buffer very quickly because dd just is submitting very
small requests (that will require a RMW).

If you set an explict block size with dd (via bs=1M), you'll notice a
significant improvement in throughput.

So I think this turns out to be a libvirt issue, not a qemu issue.

** Changed in: qemu
       Status: Confirmed => Invalid

-- 
virsh save is very slow
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Status in QEMU: Invalid
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Cole Robinson]

I filed an upstream libvirt bug for the dd block size issue:

https://bugzilla.redhat.com/show_bug.cgi?id=599091

** Bug watch added: Red Hat Bugzilla #599091
   https://bugzilla.redhat.com/show_bug.cgi?id=599091

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
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Status in QEMU: Invalid
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Dave Walker]

Changing to libvirt as commentary here, and on the upstream bug report
by Cole indicate a fix has been commit that improves this performance.

** Package changed: qemu-kvm (Ubuntu) => libvirt (Ubuntu)

** Also affects: libvirt via
   https://bugzilla.redhat.com/show_bug.cgi?id=599091
   Importance: Unknown
       Status: Unknown

-- 
virsh save is very slow
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Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed

Bug description:
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.

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

[Michael Tokarev]

14.06.2010 13:37, Dave Walker wrote:
> Changing to libvirt as commentary here, and on the upstream bug report
> by Cole indicate a fix has been commit that improves this performance.

Um.  This is not that simple, apparently.

I did some tests after this bug were discussed/mentioned last time,
and see absolutely no difference between 512 and 1M dd block size.
Well, there IS some difference, like several percents, but it is
still very slow, and is doing nothing -- the machine is 99% idle
while saving the state.  Also, when using, say, gzip or lzop in
place of dd (both of them perform input in units larger than 512
bytes), it is still as slow.

strace shows one of kvm threads is slowly poking eventfd all the
time, while others are doing right to nothing.

It looks like some bad timing issue.  The fact that changing block
size helps sometimes - I think it's because the improvements of
timing (mix-n-match), not because of real improvements.

> ** Package changed: qemu-kvm (Ubuntu) =>  libvirt (Ubuntu)

In any way, the problem is definitely NOT in libvirt, since the
same slowness is observed without libvirt.

Thanks!

/mjt

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

[Dave Walker]

Re-introducing qemu-kvm, as commentary on qemu-devel mailing list
suggest there could be a timing concern meaning poor performance.
Leaving Libvirt on this report, as upstream libvirt have quoted improved
performance adjusting the block size for dd.  However, Qemu feel that
the real issue is in the qemu/kvm code.

Thanks.

** Also affects: qemu-kvm (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qemu-kvm (Ubuntu)
       Status: New => Confirmed

** Changed in: qemu-kvm (Ubuntu)
   Importance: Undecided => Wishlist

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Chris Bainbridge]

Do you have a link for the qemu-devel thread? I had a look at
http://lists.gnu.org/archive/html/qemu-devel/ but couldn't see anything.

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Laine Stump]

> Bug description: 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...)

Here's the Fedora bug:

https://bugzilla.redhat.com/show_bug.cgi?id=599091

Note that I've already pushed a patch upstream that fixes the problem 
(reduces save time for a 512MB guest from 3:47 to 0:56), and eric Blake 
has posted a more refined patch that wastes less space by invoking dd 
twice (once for libvirt's header, and again for the image) - that hasn't 
been pushed yet, but will almost definitely supercede my patch before 
the libvirt-0.8.2 release.

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

[Serge Hallyn]

Just a note that the 0.8.1 release available in maverick gives me about
a 50-second save for a 512M memory image (producing 100M outfile).  The
patch listed above and suspected of speeding the saves is not in 0.8.1.
When I hand-apply just that patch, saves take about 8 seconds, but
restore fails.  Presumably taking the whole of latest git (or 0.8.2
whenever it is released) will result in both working and fast
save/restore.

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Nikola Ciprich]

Hi, just wanted to report, I just tried libvirt-0.8.2 which should use larger dd blocksize.
save is still painfully slow, about 1MB/s while host is totally
idle...
regards
nik


On Tue, Jun 22, 2010 at 07:02:08PM -0000, Serge Hallyn wrote:
> Just a note that the 0.8.1 release available in maverick gives me about
> a 50-second save for a 512M memory image (producing 100M outfile).  The
> patch listed above and suspected of speeding the saves is not in 0.8.1.
> When I hand-apply just that patch, saves take about 8 seconds, but
> restore fails.  Presumably taking the whole of latest git (or 0.8.2
> whenever it is released) will result in both working and fast
> save/restore.
> 
> -- 
> virsh save is very slow
> https://bugs.launchpad.net/bugs/524447
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> 
> Status in libvirt virtualization API: Unknown
> Status in QEMU: Invalid
> Status in “libvirt” package in Ubuntu: Confirmed
> Status in “qemu-kvm” package in Ubuntu: Confirmed
> 
> Bug description:
> 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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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Iggy]

You may want to try the patch to qemu that avi just posted to the qemu-
devel mailing list. I think this would probably fix your issue.

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Frederic Van Espen]

Iggy, which patch exactly? I don't seem to be able to find it.

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
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devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[earl]

Frederic, this patch:
http://www.mail-archive.com/qemu-devel@nongnu.org/msg37743.html

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Serge Hallyn]

Frederick,

please let me know if you can confirm that this patch fixes it for you.  If you need
me to set up a ppa with that patch, please let me know.

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[Serge Hallyn]

@earl,

thanks for finding the specific patch!

-- 
virsh save is very slow
https://bugs.launchpad.net/bugs/524447
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devel-ml, which is subscribed to QEMU.

Status in libvirt virtualization API: Unknown
Status in QEMU: Invalid
Status in “libvirt” package in Ubuntu: Confirmed
Status in “qemu-kvm” package in Ubuntu: Confirmed

Bug description:
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.

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

[EsbenHaabendal]

Will a fix for this go into maverick?

This is quite critical for using kvm/libvirt for virtual server hosting
on maverick.

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Invalid
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Paolo Bonzini]

The patch is in 0.13.0, so changing the status.

** Changed in: qemu
       Status: Invalid => Fix Released

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Fix Released
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[EsbenHaabendal]

How should I interpret "Fix Released"?

qemu in maverick is still 0.12.5 and 0.12.3 in lucid.

Will this not be fixed in current stable LTS and non-LTS releases?

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Fix Released
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Michael Tokarev]

03.01.2011 16:23, EsbenHaabendal wrote:
> How should I interpret "Fix Released"?
> 
> qemu in maverick is still 0.12.5 and 0.12.3 in lucid.

Not all the world is ubuntu.  In qemu (and qemu-kvm) the
issue is fixed in 0.13, which were released quite some
time ago.

> Will this not be fixed in current stable LTS and non-LTS releases?

There's no "stable LTS" and "non-LTS" releases in qemu,
there are plain releases.

/mjt

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

[EsbenHaabendal]

Michael Tokarev <mjt@tls.msk.ru> writes:

> 03.01.2011 16:23, EsbenHaabendal wrote:
>> How should I interpret "Fix Released"?
>> 
>> qemu in maverick is still 0.12.5 and 0.12.3 in lucid.
>
> Not all the world is ubuntu.  In qemu (and qemu-kvm) the
> issue is fixed in 0.13, which were released quite some
> time ago.
>
>> Will this not be fixed in current stable LTS and non-LTS releases?
>
> There's no "stable LTS" and "non-LTS" releases in qemu,
> there are plain releases.

Ok.  I see.

And the current importance for libvirt (Ubuntu) and qemu-kvm (Ubuntu) is
marked as "Wishlist".

So my question goes to these two components.  When can we expect to see
this fixed in current Ubuntu releases, of which I currently count at
least maverick and lucid.

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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:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Serge Hallyn]

Hi,

please test the qemu-kvm packages in ppa:serge-hallyn/virt for lucid
(0.12.3+noroms-0ubuntu10slowsave2) and maverick (0.12.5+noroms-
0ubuntu7slowsave2), which have the proposed patch from upstream.  If
they succeed, then I will proceed with the SRU.

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Fix Released
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Serge Hallyn]

** Branch linked: lp:~serge-hallyn/ubuntu/maverick/qemu-kvm/slowsave

** Branch linked: lp:~serge-hallyn/ubuntu/lucid/qemu-kvm/slowsave

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Fix Released
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Serge Hallyn]

** Attachment added: "amd64 .debs for lucid"
   https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/+attachment/1908989/+files/slowsave-lucid-debs.tgz

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Title:
  virsh save is very slow

Status in libvirt virtualization API:
  Unknown
Status in QEMU:
  Fix Released
Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  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.

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

[Serge Hallyn]

** Attachment added: "amd64 debs for maverick"
   https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447/+attachment/1909040/+files/slowsave-mav-debs.tgz

** Changed in: libvirt (Ubuntu)
       Status: Confirmed => Invalid

** Also affects: libvirt (Ubuntu Lucid)
   Importance: Undecided
       Status: New

** Also affects: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided
       Status: New

** Also affects: libvirt (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Also affects: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Changed in: qemu-kvm (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: New => In Progress

** Changed in: qemu-kvm (Ubuntu Maverick)
       Status: New => In Progress

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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:
  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.

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

[Serge Hallyn]

In order to proceed with SRU, we need someone to confirm that the debs
in comment #21 or #22 work for them.

** Description changed:

+ ==================================
+ 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.

** Tags added: verification-needed

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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.

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

[dum8d0g]

Using ubuntu natty narwhal installed today (2011-03-24) I tried to do a
snapshot with the help of libvirt. Here are the results using natty
version of qemu-kvm and libvirt and using presented slowdown packages.

root@koberec:~# time virsh snapshot-create 1
Domain snapshot 1300968929 created

real    4m39.594s
user    0m0.000s
sys     0m0.020s
root@koberec:~# cd /storage/slowsave/
root@koberec:/storage/slowsave# dpkg -l | grep -E 'libvirt|qemu'                                                                                                                                                 
ii  libvirt-bin                     0.8.8-1ubuntu5                           the programs for the libvirt library
ii  libvirt0                        0.8.8-1ubuntu5                           library for interfacing with different virtualization systems
ii  qemu-common                     0.14.0+noroms-0ubuntu3                   qemu common functionality (bios, documentation, etc)
ii  qemu-kvm                        0.14.0+noroms-0ubuntu3                   Full virtualization on i386 and amd64 hardware
root@koberec:/storage/slowsave# dpkg -r qemu-common qemu-kvm                                                                                                                                                     
root@koberec:/storage/slowsave# dpkg -i qemu-common_0.12.5+noroms-0ubuntu7.2_all.deb qemu-kvm_0.12.5+noroms-0ubuntu7.2_amd64.deb 
root@koberec:/storage/slowsave# pkill kvm; sleep 5; service libvirt-bin restart
root@koberec:/storage/slowsave# time virsh snapshot-create 1
Domain snapshot 1300969754 created

real    2m22.055s
user    0m0.000s
sys     0m0.010s
root@koberec:/storage/slowsave# qemu-img snapshot -l /storage/debian.qcow2 | tail -n 1
8         1300969754              57M 2011-03-24 08:29:14   00:03:37.652
root@koberec:/storage/slowsave# virsh console 1
Connected to domain vm
Escape character is ^]

Debian GNU/Linux 5.0 debian ttyS0

debian login: root
Password: 
Last login: Thu Mar 24 08:15:18 EDT 2011 on ttyS0
Linux debian 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
debian:~# free -m
             total       used       free     shared    buffers     cached
Mem:           561         39        521          0          4         16
-/+ buffers/cache:         19        542
Swap:          478          0        478
debian:~# 
root@koberec:/storage/slowsave# dd if=/dev/urandom of=/storage/emptyfile bs=1M count=40
40+0 records in
40+0 records out
41943040 bytes (42 MB) copied, 5.4184 s, 7.7 MB/s


I am not sure if my measurements are relevant to anything in here, but I hope so.

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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.

[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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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.

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

[Serge Hallyn]

To be clear, please re-install the stock natty packages, do a virsh
snapshot-create, and then do 'ubuntu-bug libvirt-bin' to file a new bug.
Then please give the info I asked for in comment 25 in that bug.

Thanks!

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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.

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

[dum8d0g]

In reply to question #26
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/741887

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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.

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

[dum8d0g]

In reply to question #25: everything is included in #27. Is it enough?

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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.

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

[Serge Hallyn]

Yes, thanks.

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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.

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

[Jeff Snider]

I'd like to help get this fixed, particularly in Lucid.  What can I do?
Does #21 and #22 still need testing?

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

[Serge Hallyn]

@Jeff,

they do still need testing.  However at this point new ones need to be
generated.  There is a bit of a backlog on libvirt updates  to push.
Depending on how those go, I could get packages into -proposed either
next week or in 2-3 weeks.

I'll make a note to queue this, and ping here when I've pushed a fix to
-proposed, asking you to test.

Thanks!

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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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Serge Hallyn]

Oops, this is for qemu-kvm, not libvirt.  That can go immediately.

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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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Serge Hallyn]

(setting importance to medium because it has a moderate impact on a core
application, and especially because it has no workaround)

** Changed in: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided => Medium

** Changed in: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided => Medium

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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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[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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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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Serge Hallyn]

Actually maverick is waiting for a fix for bug 790145 to be verified,
but lucid is free.  I've uploaded the proposed fix to lucid-proposed,
it's waiting for an SRU admin to approve it.  I will also post the amd64
lucid .debs at http://people.canonical.com/~serge/qemu-slow-save/.

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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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Clint Byrum]

Hello Chris, or anyone else affected,

Accepted qemu-kvm into lucid-proposed, the package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!

** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: In Progress => Fix Committed

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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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Jeff Snider]

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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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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Clint Byrum]

Jeff thanks for the testing!

I'll take that as verification.. marking verification-done. It just
needs to wait 7 days to clear -proposed in case it causes any unintended
regressions.

** Tags removed: verification-needed
** Tags added: verification-done

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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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Jamie Strandboge]

I'm sorry, the lucid qemu-kvm update has been superseded by a security
update in 0.12.3+noroms-0ubuntu9.15.

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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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Serge Hallyn]

I'm sorry - per the rules listed in
https://wiki.ubuntu.com/StableReleaseUpdates, only bugs which are >=
high priority are eligible for SRU. If you feel this bug should be high
priority, please say so (with rationale) here.

An updated package for lucid through natty will be placed in the ubuntu-
virt ppa (https://launchpad.net/~ubuntu-virt/+archive/ppa) as an
alternative way to get this fix.


** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: Fix Committed => Won't Fix

** Changed in: qemu-kvm (Ubuntu Maverick)
       Status: In Progress => Won't Fix

** Changed in: libvirt (Ubuntu Lucid)
       Status: New => Won't Fix

** Changed in: libvirt (Ubuntu Maverick)
       Status: New => Won't Fix

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
Status in “libvirt” source package in Maverick:
  Won't Fix
Status in “qemu-kvm” source package in Maverick:
  Won't Fix

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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Jeff Snider]

The page you referenced doesn't include anything that I can find about
the ticket priority level.  It states that "Stable release updates will,
in general, only be issued in order to fix high-impact bugs" and
provides several examples.  Among them is "Bugs which do not fit under
above categories, [security vulnerabilities, severe regressions, or loss
of user data] but (1) have an obviously safe patch and (2) affect an
application rather than critical infrastructure packages (like X.org or
the kernel)."

I submit that this is an "obviously safe patch."  The change is small,
simple, isolated, has been tested to work, and doesn't change any
interfaces.  Is qemu-kvm considered a "critical infrastructure package"
or not?  I don't know the answer to that, but I can see valid arguments
both for and against.

I also have an example of a potential data loss situation, though it is
admittedly somewhat weak.  I'll spare everyone the narrative but I'll
share it if it would be helpful.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
Status in “libvirt” source package in Maverick:
  Won't Fix
Status in “qemu-kvm” source package in Maverick:
  Won't Fix

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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Chris Halse Rogers]

Serge - why do you think this can't be SRU'd?  It's already been
accepted into lucid-proposed once, then verified, and the only reason
it's not in lucid-updates is that it got superseded by a security upload
before the 7-day testing period had elapsed.

If you made a new upload to lucid-proposed based on the new security
upload I see no reason why it couldn't be accepted and then copied to
-updates after it's been verified and the 7-day testing period has
ended.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
Status in “libvirt” source package in Maverick:
  Won't Fix
Status in “qemu-kvm” source package in Maverick:
  Won't Fix

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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Michael Tokarev]

I see activity around this bug is going on and on, but I don't understand -- is the talk about this patch --
http://anonscm.debian.org/gitweb/?p=collab-maint/qemu-kvm.git;a=commit;h=7e32b4ca0ea280a2e8f4d9ace1a15d5e633d9a95

?

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
Status in “libvirt” source package in Maverick:
  Won't Fix
Status in “qemu-kvm” source package in Maverick:
  Won't Fix

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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Jeff Snider]

Michael: Yes, that is the correct patch.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
Status in “libvirt” source package in Maverick:
  Won't Fix
Status in “qemu-kvm” source package in Maverick:
  Won't Fix

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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Michael Tokarev]

I just wanted to point out that we've this patch in Debian since ages,
and it's been included in upstream for a long time too.  Added a debbug
reference for this as well.

** Bug watch added: Debian Bug tracker #597517
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597517

** Also affects: qemu-kvm (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597517
   Importance: Unknown
       Status: Unknown

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
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:
  Unknown

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Bug Watch Updater]

** Changed in: qemu-kvm (Debian)
       Status: Unknown => Fix Released

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[BenLake]

@Serge @Chris - So it sounds like this _could_ make it into Lucid?
Anyone I can bribe to make that happen?

As an aside, I have been running LTS versions for 8 years and I must say
it seems we need a different priority scale for LTS. This bug renders
the use of kvm in 10.04 very painful and the plan would be to let that
exist for 5 years? Feels like a lot of key improvements are overlooked
because they don't make your machine explode, but from a sys admins
perspective, it feels like the risks of running the latest versions so
bug fixes trickle in outweighs the missing bits in an unmaintained LTS
:/

This issue + this one
(https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/555981) makes
for a sad day.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Won't Fix
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.

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Serge Hallyn]

** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: Won't Fix => New

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  New
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Martin Pitt]

Hello Chris, or anyone else affected,

Accepted qemu-kvm into lucid-proposed. The package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!

** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: New => Fix Committed

** Tags removed: verification-done

** Tags added: verification-needed

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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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https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Jeff Snider]

Lucid 10.04.4 amd64 host.  2.6.32-38-server.  All packages up to date.

Guest:
	Win 7 64bit
	1Gb RAM (all in use in guest)
	2 vproc
	VirtIO disk (virtio-win-0.1-22)
	VirtIO network
	2 IDE cdroms
	VNC display

virsh save:
	0.12.3+noroms-0ubuntu9.17		503.8 seconds
	0.12.3+noroms-0ubuntu9.18		26.4 seconds

Tested virsh start, stop, save, restore, suspend, resume, shutdown,
destroy.  All works as expected.  Guest functionality unchanged.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[Clint Byrum]

Thanks Jeff! Barring any regressions being reported, this should arrive
in lucid-updates around the 24th.

** Tags removed: verification-needed
** Tags added: verification-done

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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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[Qemu-devel] [Bug 524447] Re: virsh save is very slow

[BenLake]

Is something holding up the release to lucid-updates?

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Clint Byrum]

Ben, yes, sorry I missed the fact that there was already another bug
that needs verification in lucid-proposed. Bug #592010 needs to be
verified, or reverted, before this one can proceed to lucid-updates.
Verification is tricky, since one needs to do a hardy -> lucid upgrade
to verify it.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Jeff Snider]

I'll go stand up some vms to test that one out.

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Jeff Snider]

I tested that other bug.  As far as I can tell it is not fixed.  I
haven't gotten any sort of response on it for a week.  So... now what?

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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:
  Won't Fix
Status in “qemu-kvm” source package in Lucid:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.12.3+noroms-0ubuntu9.18

---------------
qemu-kvm (0.12.3+noroms-0ubuntu9.18) lucid-proposed; urgency=low

  [ Michael Tokarev ]
  * QEMUFileBuffered:-indicate-that-were-ready-when-the-underlying-file-is-ready.diff
   (patch from upstream to speed up migration dramatically)
   (closes: #597517) (LP: #524447)

  [ Serge Hallyn ]
  * debian/control: make qemu-common replace qemu (<< 0.12.3+noroms-0ubuntu9.17)
    (LP: #592010)
 -- Serge Hallyn <serge.hallyn@ubuntu.com>   Mon, 13 Feb 2012 11:24:18 -0600

** Changed in: qemu-kvm (Ubuntu Lucid)
       Status: Fix Committed => Fix Released

-- 
You received this bug notification because you are a member of qemu-
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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:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[BenLake]

Just wanted to say thanks to everyone who got this fix out. Works great!

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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:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions

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

[Bug Watch Updater]

Launchpad has imported 4 comments from the remote bug at
https://bugzilla.redhat.com/show_bug.cgi?id=599091.

If you reply to an imported comment from within Launchpad, your comment
will be sent to the remote bug automatically. Read more about
Launchpad's inter-bugtracker facilities at
https://help.launchpad.net/InterBugTracking.

------------------------------------------------------------------------
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

------------------------------------------------------------------------
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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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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/libvirt/+bug/524447/+subscriptions