linux-kernel - Re: Performance versus FreeBSD 7.0

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Date:	Thu, 6 Mar 2008 14:12:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andi Kleen <andi@...stfloor.org>, Cyrus Massoumi <cyrusm@....net>,
	Diego Calleja <diegocg@...il.com>,
	Stephen Cuppett <cuppett@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, a.p.zijlstra@...llo.nl
Subject: Re: Performance versus FreeBSD 7.0

> 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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