Date: Sat, 8 Apr 1995 12:47:31 -0700 (PDT) From: Poul-Henning Kamp <phk@ref.tfs.com> To: rgrimes@gndrsh.aac.dev.com (Rodney W. Grimes) Cc: taob@gate.sinica.edu.tw, freebsd-current@FreeBSD.org Subject: Re: Disk performance Message-ID: <199504081947.MAA22769@ref.tfs.com> In-Reply-To: <199504081945.MAA15893@gndrsh.aac.dev.com> from "Rodney W. Grimes" at Apr 8, 95 12:45:38 pm
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> > > > > > Why would taking out the L2 cache slow down data transfer to and > > > from the primary cache? > > > > because checking the L2 takes time, and they don't start the mem-cycle > > until they know they missed. > > You would be right if he was talking about why turning off the L2 cache > increases memory speed. But that is not what he said ``taking out L2 > cache slowing down L1 cache''. Nothing, nota, zippo, should effect > L1 cache speeds other than code changes, and internal clock frequency. Sure, but they still need to get the stuff to put in the L1 for their test from RAM, right ? -- Poul-Henning Kamp <phk@login.dknet.dk> -- TRW Financial Systems, Inc. 'All relevant people are pertinent' && 'All rude people are impertinent' => 'no rude people are relevant'
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