Message-ID: <425F6B87.5070805@interia.pl>
Date: Fri, 15 Apr 2005 09:21:43 +0200
From: Tomasz Chmielewski <mangoo@interia.pl>
User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050322)
MIME-Version: 1.0
Cc: linux-kernel@vger.kernel.org
Subject: Re: poor SATA performance under 2.6.11 (with < 2.6.11 is OK)?
References: <425E9902.8000804@interia.pl> <20050414165535.GA15440@irc.pl> <425EE9CF.4030202@interia.pl> <20050414230317.GA12156@irc.pl>
In-Reply-To: <20050414230317.GA12156@irc.pl>
Content-Type: text/plain; charset=ISO-8859-2; format=flowed
Content-Transfer-Encoding: 7bit
To: unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1313
Lines: 37

Tomasz Torcz wrote:

>>>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.

OK thanks, I'll look for that.

What is this blacklisting really (besides that it gives bad performance 
for me)?

Does it mean that if I use a kernel which performs well on this hardware 
(i.e. 2.6.8.1, does not seem to have this blacklisting enabled yet) I 
risk data corruption?

And on a kernel in which my hardware is blacklisted, and therefore which 
performs poorly, I don't risk data corruption (at least when it comes to 
transferring data between the drive and the SATA controller)?


Tomek
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/