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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