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Date: Fri, 20 Jul 2007 23:18:19 +0100
From: Tom Judge <tom@tomjudge.com>
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To: Michael Worobcuk <mail@michaelworobcuk.de>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Dell PERC5/i SAS5/5IR  - RAID monitoring
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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 ?
> 

Not that I know of, do you have SAS or SATA disks attached to the 
controller?

Tom