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

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 0/3] support appending AIO writes
From: Sergey Meirovich <rathamahata@xxxxxxxxx>
Date: Fri, 7 Feb 2014 11:40:29 +0200
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
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In-reply-to: <20140206225132.GE13647@dastard>
References: <20140204172402.380571745@xxxxxxxxxxxxxxxxxxxxxx> <CA+QCeVRmDFjF9YMgEOR7UpdQMQU98cR0KeO1HMNoP9k1ZvOzaA@xxxxxxxxxxxxxx> <CA+QCeVQxTk=ZNucLG4WPrQC=oHf1sFtJ7nj5dhJg=BUyuVbsOQ@xxxxxxxxxxxxxx> <20140206225132.GE13647@dastard>
On 7 February 2014 00:51, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
> On Thu, Feb 06, 2014 at 06:29:11PM +0200, Sergey Meirovich wrote:
>> 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
>
> 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@xxxxxxxxx>" to the patches?

Sure, Dave. Please do.

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