Date: Wed, 02 Jan 2008 07:09:13 -0500 From: Gary Stanley <gary@velocity-servers.net> To: Kris Kennaway <kris@FreeBSD.org>,josh.carroll@gmail.com Cc: freebsd-performance@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: mysql scaling questions Message-ID: <20080102123902.8CB6213C448@mx1.freebsd.org> In-Reply-To: <477B6EB3.50202@FreeBSD.org> References: <20071201205609.GA54238@harmless.hu> <20071204130810.GA77186@harmless.hu> <47779AA7.2060801@FreeBSD.org> <20071230132451.GA61295@harmless.hu> <47779EBC.5020900@FreeBSD.org> <20071230134354.GA63555@harmless.hu> <4777A65C.8020406@FreeBSD.org> <20071230141118.GA67574@harmless.hu> <4777AB9C.1010003@FreeBSD.org> <flb6bp$8kq$1@ger.gmane.org> <8cb6106e0801012008q18830aebp906ebfeb3c519e5a@mail.gmail.com> <477B6EB3.50202@FreeBSD.org>
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At 06:00 AM 1/2/2008, Kris Kennaway wrote: >Per later discussion you will also need to either comment out the >syscalls that are (might be) being cached by glibc to artificially >inflate its reported rate, or verify that it is not doing so. > >Kris IIRC linux uses vsyscalls on x86_64, and calling things like gettimeofday() isn't as expensive as it normally should be.. vsyscalls are similar to darwins' commpage. -G
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