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Date: Mon, 03 Mar 2008 13:34:55 +0100 From: Andi Kleen <andi@...stfloor.org> To: "Stephen Cuppett" <cuppett@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Performance versus FreeBSD 7.0 "Stephen Cuppett" <cuppett@...il.com> writes: > Not lobbing the first artillery shell by any means, but I saw this > bullet on the FreeBSD release announcement: I posted a comment on that on the LWN thread, but their website has eaten it. Anyways I would be very careful with any benchmarks testing mysql especially on sysbench on larger systems (like they did with a 8 core system). I did some similar testing on a slightly larger system (16 core) some time ago and found that mysql itself didn't scale at all. With sysbench which only exercises a single table it would end up basically just banging on a single mysql user space lock and spend nearly all the kernel time in the scheduler over-scheduling like crazy. The FreeBSD people are not very clear on what they exactly benchmarked (MySQL has lots of configuration options and engines), but I'll assume they used the standard MyISAM. I don't think that's a very useful benchmark to tune for in this form at least not until MySQL is fixed to actually scale and sysbench replaced with some a little more sane. It's worse than dbench. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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