Messages in this thread | | | Date | Thu, 6 Mar 2008 09:18:23 +0100 | From | Jens Axboe <> | Subject | Re: ahci: work around ATI SB600 h/w quirk |
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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@garzik.org> > AuthorDate: Thu Feb 28 15:43:48 2008 -0500 > Committer: Jeff Garzik <jeff@garzik.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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