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

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Message-ID: <4DF929E0.1030806@codemonkey.ws>
Date:	Wed, 15 Jun 2011 16:53:36 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
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>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

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.

Our experience has been that this is actually not a great way to 
simulate fast storage.

Spindle based storage has very different characteristics than memory as 
there is a significant cost for seeking.

-hdb uses IDE too.  That's pretty unfair since IDE is limited to a 
single request at a time whereas virtio can support multiple requests 
(and native kvm tools is using virtio).

Regards,

Anthony Liguori
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