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Date: Fri, 7 Feb 2014 09:51:32 +1100
From: Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCH 0/3] support appending AIO writes
Message-ID: <20140206225132.GE13647@dastard>
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To: Sergey Meirovich <rathamahata@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>, linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com

On Thu, Feb 06, 2014 at 06:29:11PM +0200, Sergey Meirovich wrote:
> On 5 February 2014 16:52, Sergey Meirovich <rathamahata@gmail.com> wrote:
> > Hi Christoph,
> >
> > Thanks a lot! Applied your patches on top of 3.13.1 and they indeed
> > make a huge difference.
> >
> >
> > Append AIO
> >
> > chunk size           w/o patches                               with patches
> > ===================================================
> > 4k               6.8834 Mb/sec 1762.15 IOps      31.542 Mb/sec 8074.75 IOps
> > 8k               15.321 Mb/sec 1961.12 IOps      62.873 Mb/sec 8047.71 IOps
> > 16k             28.257 Mb/sec 1808.46 IOps      139.35 Mb/sec 8918.45 IOps
> 
> And with simple wrapper around io_submit() difference for 4 k is even
> more impressive than with sysbench:
> 
> without patches:
> =====================
> bandwidth (MiB/s):    11.89
> IOps:                    3044.58
> 
> with patches:
> =====================
> bandwidth (MiB/s):    118.16
> IOps:                   30250.17

Thanks for providing numbers, Sergey. It's clear that we need to
make this change from them. Can I add a "Tested-by: Sergey Meirovich
<rathamahata@gmail.com>" to the patches?

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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