linux-kernel - Combined mode quirk removal kills performance

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Message-ID: <465EDF89.9050207@tuxrocks.com>
Date:	Thu, 31 May 2007 09:45:29 -0500
From:	Frank Sorenson <frank@...rocks.com>
To:	LKML <linux-kernel@...r.kernel.org>, jeff@...zik.org
Subject: Combined mode quirk removal kills performance

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The patch to "remove combined mode quirk" (git bisect says
8cdfb29c0cd8018f92214c11c631d8926f4cb032) makes my laptop run slower
than a dead sloth.  "hdparm -T" indicates that buffered disk reads on my
hard drive drop from 48-50 MB/sec to 1-2MB/sec, and the system is nearly
unusable.

System is a Dell Inspiron E1705 (Core 2 Duo 2.16GHz) running x86_64 FC6.

Frank
- --
Frank Sorenson - KD7TZK
Linux Systems Engineer, DSS Engineering, UBS AG
frank@...rocks.com
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