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

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Date:	Thu, 16 Jun 2011 06:29:05 +0100
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Prasad Joshi <prasadjoshi124@...il.com>
Cc:	Pekka Enberg <penberg@...nel.org>, Avi Kivity <avi@...hat.com>,
	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>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

On Wed, Jun 15, 2011 at 11:04 PM, Anthony Liguori <anthony@...emonkey.ws> wrote:
> On 06/15/2011 03:13 PM, Prasad Joshi wrote:
>>
>> On Wed, Jun 15, 2011 at 6:10 PM, Pekka Enberg<penberg@...nel.org>  wrote:
>>>
>>> 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.
>>>
>>
>> The qcow2 image used for testing was copied on to /dev/shm to avoid
>> the disk delays in performance measurement.
>>
>> QEMU was invoked with following parameters
>>
>> $ qemu-system-x86_64 -hda<disk image on hard disk>  -hdb
>> /dev/shm/test.qcow2 -m 1024M
>
> Looking more closely at native KVM tools, you would need to use the
> following invocation to have an apples-to-apples comparison:
>
> qemu-system-x86_64 -drive file=/dev/shm/test.qcow2,cache=writeback,if=virtio

In addition to this it is important to set identical guest RAM sizes
(QEMU's -m <ram_mb>) option.

If you are comparing with qemu.git rather than qemu-kvm.git then you
need to ./configure --enable-io-thread and launch with QEMU's
-enable-kvm option.

Stefan
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