[PATCH 0/3] support appending AIO writes

[Sergey Meirovich]

On 7 February 2014 00:51, Dave Chinner <david at fromorbit.com> wrote:
> On Thu, Feb 06, 2014 at 06:29:11PM +0200, Sergey Meirovich wrote:
>> On 5 February 2014 16:52, Sergey Meirovich <rathamahata at 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 at gmail.com>" to the patches?

Sure, Dave. Please do.