linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool v2

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Date:	Wed, 15 Jun 2011 20:10:17 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

On Wed, Jun 15, 2011 at 7:30 PM, Avi Kivity <avi@...hat.com> wrote:
> On 06/15/2011 06:53 PM, Pekka Enberg wrote:
>>
>> - Fast QCOW2 image read-write support beating Qemu in fio benchmarks. See
>> the
>>   following URL for test result details: https://gist.github.com/1026888
>
> This is surprising.  How is qemu invoked?

Prasad will have the details. Please note that the above are with Qemu
defaults which doesn't use virtio. The results with virtio are little
better but still in favor of tools/kvm.

> btw the dump above is a little hard to interpret.

It's what fio reports. The relevant bits are:


Qemu:

Run status group 0 (all jobs):
  READ: io=204800KB, aggrb=61152KB/s, minb=15655KB/s, maxb=17845KB/s,
mint=2938msec, maxt=3349msec
 WRITE: io=68544KB, aggrb=28045KB/s, minb=6831KB/s, maxb=7858KB/s,
mint=2292msec, maxt=2444msec

Run status group 1 (all jobs):
  READ: io=204800KB, aggrb=61779KB/s, minb=15815KB/s, maxb=17189KB/s,
mint=3050msec, maxt=3315msec
 WRITE: io=66576KB, aggrb=24165KB/s, minb=6205KB/s, maxb=7166KB/s,
mint=2485msec, maxt=2755msec

Run status group 2 (all jobs):
  READ: io=204800KB, aggrb=6722KB/s, minb=1720KB/s, maxb=1737KB/s,
mint=30178msec, maxt=30467msec
 WRITE: io=65424KB, aggrb=2156KB/s, minb=550KB/s, maxb=573KB/s,
mint=29682msec, maxt=30342msec

Run status group 3 (all jobs):
  READ: io=204800KB, aggrb=6994KB/s, minb=1790KB/s, maxb=1834KB/s,
mint=28574msec, maxt=29279msec
 WRITE: io=68192KB, aggrb=2382KB/s, minb=548KB/s, maxb=740KB/s,
mint=27121msec, maxt=28625msec

Disk stats (read/write):
 sdb: ios=60583/6652, merge=0/164, ticks=156340/672030,
in_queue=828230, util=82.71%

tools/kvm:

Run status group 0 (all jobs):
   READ: io=204800KB, aggrb=149162KB/s, minb=38185KB/s,
maxb=46030KB/s, mint=1139msec, maxt=1373msec
  WRITE: io=70528KB, aggrb=79156KB/s, minb=18903KB/s, maxb=23726KB/s,
mint=804msec, maxt=891msec

Run status group 1 (all jobs):
   READ: io=204800KB, aggrb=188235KB/s, minb=48188KB/s,
maxb=57932KB/s, mint=905msec, maxt=1088msec
  WRITE: io=64464KB, aggrb=84821KB/s, minb=21751KB/s, maxb=27392KB/s,
mint=570msec, maxt=760msec

Run status group 2 (all jobs):
   READ: io=204800KB, aggrb=20005KB/s, minb=5121KB/s, maxb=5333KB/s,
mint=9830msec, maxt=10237msec
  WRITE: io=66624KB, aggrb=6615KB/s, minb=1671KB/s, maxb=1781KB/s,
mint=9558msec, maxt=10071msec

Run status group 3 (all jobs):
   READ: io=204800KB, aggrb=66149KB/s, minb=16934KB/s, maxb=17936KB/s,
mint=2923msec, maxt=3096msec
  WRITE: io=69600KB, aggrb=26717KB/s, minb=6595KB/s, maxb=7342KB/s,
mint=2530msec, maxt=2605msec

Disk stats (read/write):
  vdb: ios=61002/6654, merge=0/183, ticks=27270/205780,
in_queue=232220, util=69.46%
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