Date: Fri, 09 Dec 2005 08:23:26 +0800 From: David Xu <davidxu@freebsd.org> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: Michael Vince <mv@roq.com>, freebsd-performance@freebsd.org, "Gustavo A. Baratto" <gbaratto@superb.net> Subject: Re: new benchmarks. WAS: FreeBSD MySQL still WAY slower than Linux Message-ID: <4398CE7E.5050007@freebsd.org> In-Reply-To: <20051209000704.GA80362@wantadilla.lemis.com> References: <04f401c5f630$b9af6570$6450fb40@guinness> <438FB036.3000804@roq.com> <20051209000704.GA80362@wantadilla.lemis.com>
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Greg 'groggy' Lehey wrote: >I've heard this claim again and again, and I intend to look at it when >I have time. I find it difficult to believe that this alone could >explain the sometimes horrendous performance differences (3 to 1) that >have been reported. > >Can somebody tell me: > >1. How many calls there are per second? >2. Where they're coming from? This would involve profiling, of > course. > >Greg >-- >See complete headers for address and phone numbers. > > You find ktrace result of mysql: http://people.freebsd.org/~davidxu/mysql/mysql_ktrace.txt gettimeofday() almost follows every network I/O. Also you can find its I/O size: http://people.freebsd.org/~davidxu/mysql/iosize.txt I guess the gettimeofday() call is relevant to mysql's connection keepalive work, sounds like a very silly method. David Xu
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