Date: Fri, 15 Apr 2005 01:03:17 +0200
From: Tomasz Torcz <zdzichu@irc.pl>
To: linux-kernel@vger.kernel.org
Subject: Re: poor SATA performance under 2.6.11 (with < 2.6.11 is OK)?
Message-ID: <20050414230317.GA12156@irc.pl>
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References: <425E9902.8000804@interia.pl> <20050414165535.GA15440@irc.pl> <425EE9CF.4030202@interia.pl>
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On Fri, Apr 15, 2005 at 12:08:15AM +0200, Tomasz Chmielewski wrote:
> >>The performance under 2.6 kernels is *very* poor (Timing buffered disk
> >>reads never more than 20 MB/sec); under 2.4 it runs quite fine (Timing
> >>buffered disk reads around 60 MB/sec).
> >
> >
> > 2.4 risk data corruption. 2.6 sata_sil.c contains blacklist for some
> >driver-controller combination.
> >
> > See: http://home-tj.org/m15w/
> 
> ...but this link just doesn't explain why performance is sooo bad with 
> 2.6.11.x kernels (Timing buffered disk reads at 10-20 MB/sec), and is 
> just OK with older 2.6 kernels (Timing buffered disk reads even at about 
> 100 MB/sec with 2.6.8.1).
> 
> any clue?

 The sata_sil blacklist grown over time. Older version didn't mark your
drive as bad. Check sata_sil history at
http://www.linuxhq.com/kernel/file/drivers/scsi/sata_sil.c ,
you may find exact time when your drive got blacklisted.

-- 
Tomasz Torcz                        To co nierealne - tutaj jest normalne.
zdzichu@irc.-nie.spam-.pl          Ziomale na ?ycie maj? tu patenty specjalne.

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