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Date: Tue, 20 Nov 2007 22:33:37 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Claus Guttesen <kometen@gmail.com>
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Cc: Attilio Rao <attilio@freebsd.org>, freebsd-stable@freebsd.org,
	Alexey Popov <lol@chistydom.ru>
Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD
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Claus Guttesen wrote:
>>> FWIW, we are seeing 2 x quad-core 2.66GHz outperform (per core) 2 x
>>> dual-core 3GHz on the same type of m/b, apparently because of better
>>> bandwidth to memory. However, this is on a compute-intensive workload
>>> running 1 job per core so would be pretty insensitive to
>>> scheduler/locking issues.
>> Alexey's problem is pretty specific to filesystem performance.  Good to
>> hear though :)
> 
> If that is the conclusion, wouldn't it make sense trying a different
> disk-controller then?

Filesystem, not disk.  See my earlier email for more detailed discussion.

Kris