Date: Wed, 22 Mar 1995 09:29:50 -0800 (PST) From: Poul-Henning Kamp <phk@ref.tfs.com> To: kuku@gilberto.physik.rwth-aachen.de (Christoph P. Kukulies) Cc: freebsd-hackers@freefall.cdrom.com Subject: Re: Why IDE is bad Message-ID: <199503221729.JAA05864@ref.tfs.com> In-Reply-To: <199503221058.LAA08924@gilberto.physik.rwth-aachen.de> from "Christoph P. Kukulies" at Mar 22, 95 11:58:46 am
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> Regarding the difference in CPU utilization, could it be - I don't > know the driver internals - that it's the bounce buffer technique > that costs CPU while the SCSI controller uses bus master transfers all > the time? Or were you comparing VLB EIDE vs. SCSI ? The difference is because the CPU does the transfer from IDE with a "REP INSW" instruction... -- 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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