linux-kernel - Re: [patch v4 0/3] aio: implement request batching [more performance numbers]

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Message-ID: <x49y6no8jxw.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 06 Oct 2009 14:18:51 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	zach.brown@...cle.com, linux-aio <linux-aio@...ck.org>,
	Linux Kernel Mailing <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch v4 0/3] aio: implement request batching [more performance numbers]

Jens Axboe <jens.axboe@...cle.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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