Date: Fri, 20 Jul 2007 22:08:20 +0200 From: Michael Worobcuk <mail@michaelworobcuk.de> To: Tom Judge <tom@tomjudge.com> Cc: freebsd-stable@freebsd.org Subject: Re: Dell PERC5/i SAS5/5IR - RAID monitoring Message-ID: <932C632C-A89B-427F-92EC-71B351D66D17@michaelworobcuk.de> In-Reply-To: <469DE961.9060608@tomjudge.com> References: <4CC93356-890C-43DF-A905-0B9ABC990223@michaelworobcuk.de> <469D5061.8060306@tomjudge.com> <2F1F8117-86EF-49B4-AB4E-8A656727570A@michaelworobcuk.de> <469DE961.9060608@tomjudge.com>
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> 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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