linux-kernel - Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed

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Date:	Wed, 09 Dec 2009 13:09:49 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed

Corrado Zoccolo <czoccolo@...il.com> writes:

> The numbers look good. Now, there is no penalty in having low_latency
> set for sequential writes, and just a small penalty for random ones.
> The fact that random reads are faster with low_latency set is interesting.
> Is the test is running with your patched tiobench (so that the number
> of random operations is comparable with sequential ones)?

No, I forgot all about that.  The number of random operations defaults
to 4000, which is pretty low.  I'll re-run the tests with a number
comparable to the sequential runs.  Sorry about that.

Cheers,
Jeff
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