Am 21.07.2007 um 21:33 schrieb Scott Long:
Michael Worobcuk wrote:
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 ?
Send me output from bootverbose. Also ensure that you have the
following line in your /boot/loader.conf file:
hw.mpt.enable_sata_wc=1
Yuppa, that worked !
Final score for writes: 285
Final score for reads : 16692
It was the line in my /boot/loader.conf.
Thank you very very much. Very cool :)
Michael
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