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Re: [PATCH 0/3] support appending AIO writes

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 0/3] support appending AIO writes
From: Sergey Meirovich <rathamahata@xxxxxxxxx>
Date: Thu, 6 Feb 2014 18:29:11 +0200
Cc: xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
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On 5 February 2014 16:52, Sergey Meirovich <rathamahata@xxxxxxxxx> 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

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