Date: Tue, 15 Jun 2004 13:06:13 +0200 From: Cedric Tabary <cedric@carpediem.fr> To: freebsd-current@freebsd.org Cc: freebsd-threads@freebsd.org Subject: Re: Possible Threading problem with -CURRENT / MySQL? Message-ID: <20040615110613.GB81104@efrei.fr> In-Reply-To: <Pine.NEB.3.96L.1040614174214.42340B-100000@fledge.watson.org> References: <03db01c4524f$f60d5760$6401a8c0@animal> <Pine.NEB.3.96L.1040614174214.42340B-100000@fledge.watson.org>
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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 :/ -- Cédric Tabary _______________________________________________ freebsd-threads@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-threads To unsubscribe, send any mail to "freebsd-threads-unsubscribe@freebsd.org"
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