From owner-freebsd-performance@FreeBSD.ORG  Sat Feb 17 08:37:08 2007
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Date: Sat, 17 Feb 2007 09:12:57 +0100
From: "Claus Guttesen" <kometen@gmail.com>
To: "Steven H. Baeighkley" <stevenb@frii.com>
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Cc: freebsd-performance@freebsd.org
Subject: Re: bizarre performance issues in 6.2 release
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> We have been having some trouble with an upgrade to 6.2-Release. The
> performance just seems out of whack. We concede that there could be a
> reporting issue, but the results we are seeing are far too strange for
> that to be our first inclination.
>
> Background:
>
> We have 2 identical supermicro superserver 6022c. These have dual 2.0
> Xeons with hyperthreading and 2 GB of RAM. A full description of the
> system is avaialble here
>
> http://www.supermicro.com/products/system/2U/6022/SYS-6022C.cfm

Try disabling hyperthreading on the 6.2-server. In some cases you get
a moderate performance-increase, in most cases this setting is
counter-productive.

regards
Claus