Date: Tue, 15 Jun 2004 13:12:18 +0200 From: "Lasse Laursen" <laursen@netgroup.dk> To: "Cedric Tabary" <cedric@carpediem.fr>, freebsd-current@freebsd.org Cc: freebsd-threads@freebsd.org Subject: Re: Possible Threading problem with -CURRENT / MySQL? Message-ID: <045c01c452cb$16f4b0b0$ce01000a@animal> References: <03db01c4524f$f60d5760$6401a8c0@animal> <Pine.NEB.3.96L.1040614174214.42340B-100000@fledge.watson.org> <20040615110613.GB81104@efrei.fr>
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Hi, Have you had any lockups in MySQL with your setup? We have tried to disable HTT and hopefully that will solve the problem. Regards -- Lasse Laursen · VP, Hosting Technology · NetGroup Processing Aps St. Kongensgade 40H · DK-1264 Copenhagen K, Denmark Phone: +45 3370 1526 · Fax: +45 3313 0066 - Don't be fooled by cheap finnish imitations - BSD is the One True Code ----- Original Message ----- From: "Cedric Tabary" <cedric@carpediem.fr> To: <freebsd-current@freebsd.org> Cc: "Lasse Laursen" <laursen@netgroup.dk>; <freebsd-threads@freebsd.org>; "mike" <mike@mike2k.com>; "Petri Helenius" <pete@he.iki.fi> Sent: Tuesday, June 15, 2004 1:06 PM Subject: Re: Possible Threading problem with -CURRENT / MySQL? > On 14/06/2004 17:43, Robert Watson wrote: > > On Mon, 14 Jun 2004, Lasse Laursen wrote: > > > > > Also on a SMP machine? I think that the problem is somehow related to > > > SMP machines since the problems started when we moved to a SMP box :( > > > > If you haven't already, it would certainly be worth removing SMP from the > > kernel on that box and just running a UP kernel to confirm that it's a > > problem using SMP. I don't doubt it's the case, but it's worth checking > > anyway to be sure. > > I have a similar smp config (dell poweredge 2650, dual Xeon 2.8, RAID5) > > I have best performance with linux 2.4.21-smp (not tried 2.6), > but very poor (5x less) with mysqld using libpthreads on CURRENT. > mysqld process is always in state 'kserel' or sometimes '*Giant' > > http://grumly.eu.org/~ced/dmesg.txt > http://grumly.eu.org/~ced/CED-SMP.txt (no invariants, no witness) > > mysqld with linuxthreads seems to work better ... > and even better with libc_r (but using only 1 cpu) > > Everything with HTT disabled in bios. Enabling HTT gives even worst > performance :/
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