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

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Date:	Thu, 16 Jun 2011 08:42:48 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Stefan Hajnoczi <stefanha@...il.com>
Cc:	Prasad Joshi <prasadjoshi124@...il.com>,
	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 Thu, Jun 16, 2011 at 8:29 AM, Stefan Hajnoczi <stefanha@...il.com> wrote:
> 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.

Right.

> 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.

I think Prasad is testing qemu-kvm.git.
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