[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 <address@hidden>
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.