Date: Wed, 22 Mar 1995 00:58:39 -0800 (PST) From: Poul-Henning Kamp <phk@ref.tfs.com> To: hasty@star-gate.com (Amancio Hasty) Cc: hackers@FreeBSD.org, faq@FreeBSD.org Subject: Re: Why IDE is bad Message-ID: <199503220858.AAA04645@ref.tfs.com> In-Reply-To: <199503220045.AAA09701@star-gate.com> from "Amancio Hasty" at Mar 22, 95 00:45:54 am
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> > I just made a simple test, this shows why IDE is inferior to SCSI for > > FreeBSD: > > > > Western Digital 540 Caviar EIDE disk on IDE controller: > > ------------------------------------------------------- > > Quantum Empire 2100 SCSI-II disk on VL-buslogic controller > > Do the above drives have similar performance characteristics? That is entirely insignificant. The interesting thing is that while your IDE drive transfers data, your CPU is busy. When your SCSI ctrl (for decent controllers at least) transfers data, your CPU can do other things. And we're talking a factor 8 here (twice as much data * one fourth the load). -- 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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