Date: Sat, 8 Apr 1995 09:19:53 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: taob@gate.sinica.edu.tw (Brian Tao) Cc: freebsd-current@FreeBSD.org Subject: Re: Disk performance Message-ID: <199504081619.JAA15432@gndrsh.aac.dev.com> In-Reply-To: <Pine.BSI.3.91.950408214953.787U-100000@aries.ibms.sinica.edu.tw> from "Brian Tao" at Apr 8, 95 09:51:56 pm
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> > On Sat, 8 Apr 1995, Gary Jennejohn wrote: > > > > 1st level cache: 407 MB/sec > [...] > > 1st level cache: 391 MB/sec > > Why would taking out the L2 cache slow down data transfer to and > from the primary cache? I attribute the above difference to an insignificant accuracy in the test results. (407-391)/391 = 4%, I suspect repeated runs of the same test on the same exact machine probably have a 5% variance in values. I see similiar variances with the program I use, from 227 to 263MB/sec or about 16% variation. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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