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

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Message-ID: <4679B2DE.9090903@garzik.org>
Date:	Wed, 20 Jun 2007 19:06:06 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Carlo Wood <carlo@...noe.com>, linux-kernel@...r.kernel.org
Subject: Re: SATA Harddisk speed drop of 100 MB/s

Carlo Wood wrote:
> hdparm -tT gives over 160 MB/s for my tripple 10k rpm Raptor RAID5
> on 2.6.18, as expected.
> 
> In 2.6.22-rc5 this dropped to only 60 MB/s !
> 
> Is this a known issue?
> 
> I also measured it with bonnie; I get 108 MB/s reading speed on
> 2.6.18 and only 68 MB/s on 2.6.22-rc5.

More info needed...  kernel config, before-and-after dmesg output, lspci 
output.

	Jeff



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