Date: Wed, 06 May 2009 16:18:12 +0200 From: Florian Smeets <flo@kasimir.com> To: Mark Wong <markwkm@gmail.com> Cc: freebsd-performance@freebsd.org, Selena Deckelmann <selenamarie@gmail.com>, Gabrielle Roth <gorthx@gmail.com> Subject: Re: filesystem performance Message-ID: <4A019C24.6010804@kasimir.com> In-Reply-To: <70c01d1d0905042230v3357622cgf4c8e52a2a4ead96@mail.gmail.com>
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On 05.05.09 07:30, Mark Wong wrote: > Hi everyone, > > We (PostgreSQL community) have a HP DL380 G5 that we were using to do > some very basic filesystem characterizations as part of a database > performance tuning project, so we wanted to give FreeBSD a try out of > the box. For this set of data we used 7.1. We're (us few that are > running the tests) are fairly unfamiliar with the community here, so > I'll be as brief as I can. We're basically wondering if the data > we're getting out of the box is expected, and any tuning guidelines > including what changes we should expect to see in the performance. > I guess you are using the ciss driver in this box? There was a performance regression in this driver in 7.1. This should be fixed in 7.2, which came out recently. It is believed that you should get a whole lot better IO performance with 7.2 if you are using the ciss driver. From the 7.2 release notes: A bug in the ciss(4) driver which caused low “max device openings” count and led to poor performance has been fixed. HTH, Florianhome | help
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