Date: Mon, 23 Jul 2007 15:27:02 -0700 (PDT) From: Jeff Roberson <jroberson@chesapeake.net> To: Attilio Rao <attilio@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, Jeremie Le Hen <jeremie@le-hen.org>, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_descrip.c Message-ID: <20070723152622.U561@10.0.0.1> In-Reply-To: <3bbf2fe10707231359ge18ef19s1db60160ee497bfa@mail.gmail.com> References: <200707032126.l63LQ7ea027929@repoman.freebsd.org> <20070703142714.F552@10.0.0.1> <20070723201642.GC96643@obiwan.tataz.chchile.org> <3bbf2fe10707231359ge18ef19s1db60160ee497bfa@mail.gmail.com>
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On Mon, 23 Jul 2007, Attilio Rao wrote: > 2007/7/23, Jeremie Le Hen <jeremie@le-hen.org>: >> Hi Jeff, >> >> On Tue, Jul 03, 2007 at 02:27:51PM -0700, Jeff Roberson wrote: >> > For the curious, these last two patches make a substantial improvement >> to >> > mysql write performance on my 8way opteron: >> > >> > http://people.freebsd.org/~jeff/mysqlwrite.png >> > >> > The green line is without and the blue line is with. >> >> Just for information, do you have any hint why Linux eventually >> performs better above 18 threads? > > IIRC, this workload is lockmgr() dominated now, which is particulary > unlucky for us since they are very heavy. Attilio should also mention that he is fixing this problem as his SoC project. I expect to see good gains once this is complete. Thanks, Jeff > > Attilio > > > -- > Peace can only be achieved by understanding - A. Einstein >
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