Tom Judge wrote:
As for performance issues with the SAS5/i, there is a problem in
the controller. A work arround was created by Scott Long which
created a sysctl that could be set to cause the controller to turn
on the on drive write cache's. These changes where commited to
RELENG_6 on 2007-06-05 21:32:57 UTC.
...
Here is the original commit log:
scottl 2007-06-03 23:13:05 UTC
FreeBSD src repository
Modified files:
sys/dev/mpt mpt.c mpt.h mpt_cam.c
Log:
mpt.c:
mpt.h:
Add support for reading extended configuration pages.
mpt_cam.c:
Do a top level topology scan on the SAS controller. If
any SATA device are discovered in this scan, send a passthrough
FIS to set the write cache. This is controllable through the
following tunable at boot:
hw.mpt.enable_sata_wc:
-1 = Do not configure, use the controller default
0 = Disable the write cache
1 = Enable the write cache
The default is -1. This tunable is just a hack and may be
deprecated in the future.
I set mpt.enable_sata_wc to 1, as hw.mpt.enable_sata_wc is, AFAIK not
tunable in mpt_cam.c. This did not take any effect to the
performance. Is there anything else to change ?
--
Michael
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