Date: Fri, 2 Jun 1995 18:49:39 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: henrich@crh.cl.msu.edu (Charles Henrich) Cc: henrich@crh.cl.msu.edu, freebsd-hackers@freebsd.org Subject: Re: A performance mystery Message-ID: <199506030149.SAA08899@gndrsh.aac.dev.com> In-Reply-To: <199506021826.LAA23909@freefall.cdrom.com> from "Charles Henrich" at Jun 2, 95 02:26:32 pm
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> > > Okay, try a memory bandwidth benchmark to see if we have something there > > that is grossly different. A quick and easy bcopy test is to run iozone > > that does not remove the temp file on a 1/4 memory size file repeatedly, > > that should hit the buffer cache totatally and give us ~ bcopy rates. > > The ram-speed test posted here a couple of weeks ago gives: > > Micon: 10mb/20mb > Compaq: 10mb/7mb This may be repeated, but I don't see my statements on this back from the list. ram-speed is a cache defeat program, it will *NOT* approximate bcopy rates, that is why I asked you to do iozone on 1/4 memory size. I already saw your ram-speed results in the first posting. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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