Date: Thu, 6 Mar 2008 14:12:30 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andi Kleen <andi@firstfloor.org>, Cyrus Massoumi <cyrusm@gmx.net>,
       Diego Calleja <diegocg@gmail.com>, Stephen Cuppett <cuppett@gmail.com>,
       linux-kernel@vger.kernel.org, mingo@elte.hu, a.p.zijlstra@chello.nl
Subject: Re: Performance versus FreeBSD 7.0
Message-ID: <20080306131230.GA24689@one.firstfloor.org>
References: <316a20a40802290538g55c4171y7cdbcb3a9c1d0f1b@mail.gmail.com> <47CC4B3F.8060405@gmx.net> <p73y78z5r3k.fsf@bingen.suse.de> <200803062353.07298.nickpiggin@yahoo.com.au>
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> I think since the mmap_sem madvise problem was solved, the kernel
> didn't really have any further problems with this workload.

Good.

> It is doing a lot of context switches, no IO, and not a lot of

Yes sysbench is a pretty poor benchmark i think, especially
on systems with a lot of cores. I ran into this on some of my
own testing too. I don't think it makes too much
sense to tune for it seriously, but of course it doesn't hurt
when Linux does well on it anyways.

-Andi
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