linux-kernel - Re: ahci: work around ATI SB600 h/w quirk

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Date:	Thu, 6 Mar 2008 09:18:23 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	jeff@...zik.org
Subject: Re: ahci: work around ATI SB600 h/w quirk

On Thu, Mar 06 2008, Linux Kernel Mailing List wrote:
> Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a878539ef994787c447a98c2e3ba0fe3dad984ec
> Commit:     a878539ef994787c447a98c2e3ba0fe3dad984ec
> Parent:     6ddd68615ae9b21096545d7d6ab0f04113ae8b42
> Author:     Jeff Garzik <jeff@...zik.org>
> AuthorDate: Thu Feb 28 15:43:48 2008 -0500
> Committer:  Jeff Garzik <jeff@...zik.org>
> CommitDate: Wed Mar 5 07:53:06 2008 -0500
> 
>     ahci: work around ATI SB600 h/w quirk
>     
>     This addresses the recent ATI SB600 errata, where the hardware does
>     not like 256-length PRD entries during FPDMA (aka NCQ).
>     
>     It hurts performance on SB600, but it is more important to get a
>     correct patch eliminating the data corruption/lockups, and then later
>     on tune for performance.
>     
>     We simply limit each command to a maximum of 255 sectors, on SB600.

Why not limit it to 255 segments, if that's the real issue?

-- 
Jens Axboe

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