Date: Fri, 13 Feb 2009 08:02:30 -0500 From: Charles Owens <cowens@greatbaysoftware.com> To: Scott Long <scottl@samsco.org> Cc: freebsd-scsi@freebsd.org Subject: Re: Disk performance on ESXi with FreeBSD 7.1 Message-ID: <49956F66.6080003@greatbaysoftware.com> In-Reply-To: <4994F940.7070301@greatbaysoftware.com> References: <4991BD19.1000409@sebster.com> <4991C6D5.4050400@samsco.org> <4994F940.7070301@greatbaysoftware.com>
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This is a multi-part message in MIME format. --------------020406080405090000010700 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-WatchGuard-AntiVirus: part scanned. clean action=allow Charles Owens wrote: > Scott Long wrote: > >> Sebastiaan van Erk wrote: >> >>> Hi, >>> >>> I'm running FreeBSD on ESXi but I'm having serious issues with disk >>> performance, and I'm wondering if it might have something to do with >>> the scsi driver (or the virtual hardware not returning proper values >>> for its capabilities or something).. >>> >>> ... >>> >> Run the following command: >> >> sudo camcontrol tags da0 >> >> If it returns something like this: >> >> (pass0:mpt0:0:0:0): device openings: 1 >> >> then run the following command: >> >> sudo camcontrol tags da0 -N 64 >> >> If this works in improving performance, it can be put into a startup >> script. I have no idea why the controller is misbehaving with this yet, >> but I'm working on it. >> >> Scott >> >> > I'm also seeing poor performance (much less than linux), running within > ESX Server... I'm using FreeBSD i386, single CPU, 1 GB RAM. > > I've run the "camcontrol tags da0 -N 64" command and have seen > significant improvement (dbench numbers boosted by factor of 5 or so). > Not sure it's quite enough, compared to Linux... but a big help already > (thanks!) Hmmm... my comparison with Linux here was reckless, sorry about that... please consider it withdrawn. What I definitely was seeing was a performance drop between FreeBSD 7.0 and 7.1 -- the CAM "tags" regression that you announced this morning. Thanks for sorting this out! **Charles Owens** *Great Bay Software***** --------------020406080405090000010700--
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