Date: Tue, 10 Feb 2009 19:57:06 +0100 From: Sebastiaan van Erk <sebster@sebster.com> Cc: freebsd-scsi@freebsd.org Subject: Re: Disk performance on ESXi with FreeBSD 7.1 Message-ID: <4991CE02.4060202@sebster.com> In-Reply-To: <4991C6D5.4050400@samsco.org> References: <4991BD19.1000409@sebster.com> <4991C6D5.4050400@samsco.org>
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This is a cryptographically signed message in MIME format. --------------ms090203050309080606060301 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Scott, >> <n> 1 2 4 >> freebsd 12.0009 13.6348 12.9402 (MB/s) >> linux 376.145 651.314 634.649 (MB/s) >> >> Thus there is approx a factor 30 difference for dbench 1, and I cannot >> imagine linux being that much faster just due to some performance >> tuning kernel parameters. > sudo camcontrol tags da0 > > If it returns something like this: > > (pass0:mpt0:0:0:0): device openings: 1 Yep, exactly that; the bt0 driver returned 2. > then run the following command: > > sudo camcontrol tags da0 -N 64 (pass0:mpt0:0:0:0): tagged openings now 64 (pass0:mpt0:0:0:0): device openings: 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 Unfortunately I'm still stuck at around 12-14MB/s on both the bt0 and mpt0 controllers, so the performance is not up. Thanks a lot though for the help, if I can do/test anything else, I'm right on it. 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