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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: Wed, 5 Feb 2014 16:52:27 +0200
Cc: xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
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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


On 4 February 2014 19:24, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> At least XFS can support appending AIO writes easily, and Sergey has
> demonstrated a use case for them.
>
> I've not done any performance testing myself, but ensured that xfstests
> already exercises the code path.

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