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SubjectRe: [patch v4 0/3] aio: implement request batching [more performance numbers]
Date
Jens Axboe <jens.axboe@oracle.com> writes:

> On Tue, Oct 06 2009, Jeff Moyer wrote:
>> Here's a mail I got from Nathan Roberts.
>>
>> Cheers,
>> Jeff
>>
>> ---
>>
>> Similar test as before. I had to re-upload the files so comparing
>> against last time isn't really apples-apples.
>>
>> Disk is a cciss logical drive consisting of 12 SATA drives in a RAID6
>> configuration with 128K stripes.
>>
>> Test case 1 is to read 1 million random 40K files (no file is read
>> more than once), 16 4K iocbs at a time, 100 threads.
>>
>> Test case 2 is the same except 100,000 128K files are read.
>>
>> Unit of measure is "files read per second".
>>
>>
>> 40K
>> -------------------------------------------------
>> Kernel NOOP
>> ------ ----
>> 2.6.30.5 682
>> 2.6.30.5 (w/o drop_caches) 718
>> 2.6.30.5+patch_v4 900
>> 2.6.30.5+patch_v4 (w/o drop caches) 965
>>
>>
>> 128K
>> -------------------------------------------------
>> Kernel NOOP
>> ------ ----
>> 2.6.30.5 242
>> 2.6.30.5 (w/o drop_caches) 350
>> 2.6.30.5+patch_v4 292
>> 2.6.30.5+patch_v4 (w/o drop caches) 420
>
> Nice numbers! The patch looks good to me from a quick look, if you want
> I can throw it into the testing mix tomorrow and see what kind of
> improvements I see here. With performance increase of that magnitude, we
> should get it in sooner rather than later.

I'd love it if you could run some benchmarks, thank you!

Cheers,
Jeff


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