Date: Mon, 31 May 2004 11:35:38 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: Chris Elsworth <chris@shagged.org> Cc: freebsd-threads@freebsd.org Subject: Re: Something we overlooked with MySQL and FreeBSD vs Linux? Message-ID: <Pine.GSO.4.10.10405311130250.9642-100000@pcnet5.pcnet.com> In-Reply-To: <20040531135805.GA60731@shagged.org>
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On Mon, 31 May 2004, Chris Elsworth wrote: > Sorry to drag this up again :) > > I would check myself, but I don't have access to a HT enabled machine > with FreeBSD on it anymore to check the now-default setting of this > sysctl. The last entry in UPDATING records that > machdep.hlt_logical_cpus is 1, stopping user processes from using the > logical CPUs. > > Is this still the case? I never knew about that to tweak it. I know, I > should have read UPDATING. > > If that is still 1 as default, that might explain my 50% performance > loss on FreeBSD. I don't either, but FreeBSD's performance on HT machines is not very good yet. I seem to recall some earlier reports of disabling HT and getting better performance. I think the kernel scheduler isn't yet tuned to handle HT well. -- DE
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