Date: Mon, 23 Jul 2007 22:59:19 +0200 From: "Attilio Rao" <attilio@freebsd.org> To: "Jeremie Le Hen" <jeremie@le-hen.org> Cc: Jeff Roberson <jroberson@chesapeake.net>, src-committers@freebsd.org, cvs-all@freebsd.org, cvs-src@freebsd.org Subject: Re: cvs commit: src/sys/kern kern_descrip.c Message-ID: <3bbf2fe10707231359ge18ef19s1db60160ee497bfa@mail.gmail.com> In-Reply-To: <20070723201642.GC96643@obiwan.tataz.chchile.org> References: <200707032126.l63LQ7ea027929@repoman.freebsd.org> <20070703142714.F552@10.0.0.1> <20070723201642.GC96643@obiwan.tataz.chchile.org>
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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 -- Peace can only be achieved by understanding - A. Einstein
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