Date: Thu, 16 Jun 2005 17:15:06 +0100 From: "Steve Roome" <steve@lonres.com> To: Robert Watson <rwatson@FreeBSD.org>, Daniel Eischen <eischen@vigrid.com>, Greg 'groggy' Lehey <grog@FreeBSD.org>, Guy Helmer <ghelmer@palisadesys.com>, Jon Dama <jd@ugcs.caltech.edu>, Kris Kennaway <kris@obsecurity.org>, Thomas Hurst <tom.hurst@clara.net>, Xin LI <delphij@frontfree.net>, steve@pepcross.com Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD MySQL still WAY slower than Linux Message-ID: <20050616161506.GB28794@bibipentium.lonres.com> In-Reply-To: <20050611085604.J75625@fledge.watson.org> References: <746fd037f6ca8131a8fb8938f1e346e9@lonres.com> <20050610170537.GA67849@bibipentium.lonres.com> <20050611085604.J75625@fledge.watson.org>
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Thank you all for your suggestions on this thread, here's a brief breakdown of most of the ideas from people: Billy Newsom: COMPILER, DISK, MYSQLVERSION Daniel Eischen: +/-HTT, Thread scopes Greg Lehey: MALLOC Guy Helmer: PREEMPTIVE, vfs.read_max Jon Dama: David Xu's Thrds, Ptmalloc, cpu affinity, sched+hwcacheing Kris Kennaway: +/-HTT Robert Watson: Thread scopes, LIBTHR/Linuxthr on 5 and 6?, LOCKING, HTT, SMP/UP Thomas Hurst: FreeBSD-current, Don't overload mysql! Vladimir Chukharev: COMPILEOPTS, TABLETYPES Xin Li: PROFILE, HTT insignificant The bad news is that I've not managed to get very far at all lately as MySQL has been crashing too much to even stop and test stuff elsewhere. The good news though, is that the Mysql folks have agreed to setup tests to profile mysql on identical hardware running FreeBSD and Linux with an aim to find out exactly where the problem really is. They reckon they'll spend at least two weeks trying to find out why Linux is so much faster - if they do this right I'd be surprised if we can't improve things quite a lot. Also, it'd be good if any of you who still have an interest in this could add any ideas or suggestions that may help *them* with their testing. If so, just get in touch with me asap before they get too stuck into anything that might prove fruitless. Here's hoping we can get MySQL running as well on FreeBSD as it ought to. Thanks again everyone, Steve Roome
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