linux-kernel - Re: [PATCH 00/32] AIO performance improvements/cleanups, v3

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Date:	Fri, 04 Jan 2013 10:22:47 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Kent Overstreet <koverstreet@...gle.com>
CC:	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, zab@...hat.com, bcrl@...ck.org,
	jmoyer@...hat.com, viro@...iv.linux.org.uk, tytso@....edu
Subject: Re: [PATCH 00/32] AIO performance improvements/cleanups, v3

On 2012-12-27 02:59, Kent Overstreet wrote:
> Last posting: http://article.gmane.org/gmane.linux.kernel.aio.general/3242
> 
> As before, changes should mostly be noted in the patch descriptions. 
> 
> Some random bits:
>  * flush_dcache_page() patch is new
>  * Rewrote the aio_read_evt() stuff again
>  * Fixed a few comments
>  * Included some more patches, notably the batch completion stuff
> 
> My git repo has Jens' aio/dio patches on top of this stuff. As of the
> latest version, I'm seeing a couple percent better throughput with the
> ring buffer, and I think Jens was seeing a couple percent better with
> his linked list approach - at this point I think the difference is
> noise, we're both testing with fairly crappy drivers.

I still see 10-15% better performance with my non-ring method, so it's a
bit faster than that. That's on the single device, driving that to the
maximum.


-- 
Jens Axboe

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