linux-kernel - Re: Performance regression in IO scheduler still there

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Message-ID: <x49pr8avzfl.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 26 Oct 2009 13:26:54 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	jens.axboe@...cle.com, LKML <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: Re: Performance regression in IO scheduler still there

Jan Kara <jack@...e.cz> writes:

>   Hi,
>
>   I took time and remeasured tiobench results on recent kernel. A short
> conclusion is that there is still a performance regression which I reported
> few months ago. The machine is Intel 2 CPU with 2 GB RAM and plain SATA
> drive. tiobench sequential write performance numbers with 16 threads:
> 2.6.29:              AVG       STDERR
> 37.80 38.54 39.48 -> 38.606667 0.687475
>
> 2.6.32-rc5:
> 37.36 36.41 36.61 -> 36.793333 0.408928 
>
> So about 5% regression. The regression happened sometime between 2.6.29 and
> 2.6.30 and stays the same since then... With deadline scheduler, there's
> no regression. Shouldn't we do something about it?

Background:
  http://lkml.org/lkml/2009/5/28/415

Thanks for bringing this up again.  I'll try to make some time to look
into it if others don't beat me to it.

Cheers,
Jeff
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