Date: Thu, 16 Jun 2005 17:28:27 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Steve Roome <steve@lonres.com> Cc: steve@pepcross.com, freebsd-stable@freebsd.org, Guy Helmer <ghelmer@palisadesys.com>, Kris Kennaway <kris@obsecurity.org>, Greg 'groggy' Lehey <grog@FreeBSD.org> Subject: Re: FreeBSD MySQL still WAY slower than Linux Message-ID: <20050616172638.Y27625@fledge.watson.org> In-Reply-To: <20050616161506.GB28794@bibipentium.lonres.com> References: <746fd037f6ca8131a8fb8938f1e346e9@lonres.com> <20050610170537.GA67849@bibipentium.lonres.com> <20050611085604.J75625@fledge.watson.org> <20050616161506.GB28794@bibipentium.lonres.com>
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On Thu, 16 Jun 2005, Steve Roome wrote: > 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. Please let me know if there's any support for this activity I can provide. I spent a fair amount of time identifying bottlenecks for MySQL in the 5.x cycle, and I know David Xu (davidxu@FreeBSD.org) has also spent quite a bit of time looking at the threading side, resulting in a lot of his work on libthr in 6.x. It would probably be a good idea to (a) move further discussion to performance@FreeBSD.org, and (b) make sure that the performance work is starting with a recent 6.x baseline (with debugging turned off). thanks for the time you've been putting into this! Robert N M Watson
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