linux-kernel - Re: SATA Harddisk speed drop of 100 MB/s

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Message-ID: <467D9CFD.7020603@garzik.org>
Date:	Sat, 23 Jun 2007 18:21:49 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Carlo Wood <carlo@...noe.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: SATA Harddisk speed drop of 100 MB/s

Andrew Morton wrote:
> Please see http://bugzilla.kernel.org/show_bug.cgi?id=8636
> 
> In that report a pretty large slowdown with CFQ has been identified.
> Jens has plunked a patch in there (Comment #50) and then ran away on
> vacation.
> 
> If someone can test that patch and demonstrate its goodness, I'll
> queue it up, thanks.

This has unfortunately split up into two threads.  I identified the root 
cause of the slowdown as NCQ in the thread "Re: SATA RAID5 speed drop of 
100 MB/s" on LKML.

	Jeff


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