linux-kernel - Re: [PATCH v2 0/3] Improve virtio-blk performance

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Message-ID: <CAJSP0QWcRbUPqY5dhEp00p0HKx_vaH-Hbn7gfoaQrjLvPt01=g@mail.gmail.com>
Date:	Tue, 19 Jun 2012 11:14:26 +0100
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Asias He <asias@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 0/3] Improve virtio-blk performance

On Tue, Jun 19, 2012 at 5:24 AM, Asias He <asias@...hat.com> wrote:
> On 06/18/2012 06:58 PM, Stefan Hajnoczi wrote:
>>
>> As long as the latency is decreasing that's good.  But It's worth
>> keeping in mind that these percentages are probably wildly different
>> on real storage devices and/or qemu-kvm.  What we don't know here is
>> whether this bottleneck matters in real environments - results with
>> real storage and with qemu-kvm would be interesting.
>
>
> Yes. Here is the performance data on a Fusion-IO SSD device.
>
> Fio test is performed in a 8 vcpu guest with Fusion-IO based guest using kvm
> tool.
>
>    Short version:
>     With bio-based IO path, sequential read/write, random read/write
>     IOPS boost         : 11%, 11%, 13%, 10%
>     Latency improvement: 10%, 10%, 12%, 10%

Nice, I'm glad the improvement shows on real hardware.

Stefan
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