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Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage |
Date: |
Fri, 01 Mar 2013 09:04:09 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130219 Thunderbird/17.0.3 |
On 03/01/2013 07:50 AM, Peter Lieven wrote:
> just a quick test on my desktop:
>
> ~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -k de -enable-kvm -m 1024
> -drive
> if=virtio,file=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-16470e107-713001aa6de511e0-001-test/0
> -vnc :1 -boot dc -monitor stdio
>
> using ubuntu 12.04.1 desktop and the example from docs/xbzrle.txt
Thanks. Reformatting a bit:
>
> a) with the patch
designated with '+'
> b) without the patch
designated with '-'
+ total time: 22185 milliseconds
- total time: 22410 milliseconds
Shaved 0.3 seconds, better than 1%!
+ downtime: 29 milliseconds
- downtime: 21 milliseconds
Not sure why downtime seemed worse, but probably not the end of the world.
+ transferred ram: 706034 kbytes
- transferred ram: 721318 kbytes
Fewer bytes sent - good.
+ remaining ram: 0 kbytes
- remaining ram: 0 kbytes
+ total ram: 1057216 kbytes
- total ram: 1057216 kbytes
+ duplicate: 108556 pages
- duplicate: 105553 pages
+ normal: 175146 pages
- normal: 179589 pages
+ normal bytes: 700584 kbytes
- normal bytes: 718356 kbytes
Fewer normal bytes...
+ cache size: 67108864 bytes
- cache size: 67108864 bytes
+ xbzrle transferred: 3127 kbytes
- xbzrle transferred: 630 kbytes
...and more compressed pages sent - good.
+ xbzrle pages: 117811 pages
- xbzrle pages: 21527 pages
+ xbzrle cache miss: 18750
- xbzrle cache miss: 179589
And very good improvement on the cache miss rate.
+ xbzrle overflow : 0
- xbzrle overflow : 0
Thanks, this proves it's a good patch.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Eric Blake, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Paolo Bonzini, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Eric Blake, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Eric Blake, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/01
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage,
Eric Blake <=
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/04
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Paolo Bonzini, 2013/03/04
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Peter Lieven, 2013/03/04
- Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage, Orit Wasserman, 2013/03/04