Date: Fri, 17 Oct 2008 12:42:42 -0600 (MDT) From: Scott Long <scottl@samsco.org> To: John Baldwin <jhb@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r183981 - head/sys/dev/ata/chipsets Message-ID: <20081017123919.C22184@pooker.samsco.org> In-Reply-To: <200810171603.m9HG3buK092293@svn.freebsd.org> References: <200810171603.m9HG3buK092293@svn.freebsd.org>
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On Fri, 17 Oct 2008, John Baldwin wrote: > Author: jhb > Date: Fri Oct 17 16:03:37 2008 > New Revision: 183981 > URL: http://svn.freebsd.org/changeset/base/183981 > > Log: > - For chipsets that can't do 64k transfers, fall back to 32k transfers > (still a power of 2) rather than 63k transfers. Even with 63k transfers > some machines (such as Dell SC1435's) were experiencing chronic data > corruption. It should be noted that breaking a 64K transfer into two 32K transfers is much more ideal than breaking it into a 63k transfer plus a 1k runt. Modern drive firmware actually sees the disk internally as 4k sectors now instead of 512 byte, so avoiding runt transfers and non-power-of-2 transfers helps quite a bit with performance. > - Use the MIO method to talk to the Serverworks HT1000_S1 SATA controller > like all the other SATA controllers rather than the compat PATA > method. This lets the controller see all 4 SATA ports and also > matches the behavior of the Linux driver. Thanks for working on these two issues. Scott
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