Date: Fri, 20 Jul 2007 23:18:19 +0100 From: Tom Judge <tom@tomjudge.com> To: Michael Worobcuk <mail@michaelworobcuk.de> Cc: freebsd-stable@freebsd.org Subject: Re: Dell PERC5/i SAS5/5IR - RAID monitoring Message-ID: <46A134AB.2050803@tomjudge.com> In-Reply-To: <932C632C-A89B-427F-92EC-71B351D66D17@michaelworobcuk.de> References: <4CC93356-890C-43DF-A905-0B9ABC990223@michaelworobcuk.de> <469D5061.8060306@tomjudge.com> <2F1F8117-86EF-49B4-AB4E-8A656727570A@michaelworobcuk.de> <469DE961.9060608@tomjudge.com> <932C632C-A89B-427F-92EC-71B351D66D17@michaelworobcuk.de>
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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
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