Date: Sat, 24 May 1997 13:39:16 +0200 From: sthaug@nethelp.no To: shag@concentric.net Cc: hackers@FreeBSD.ORG Subject: Re: Controler for SCSI Message-ID: <25678.864473956@verdi.nethelp.no> In-Reply-To: Your message of "Sat, 24 May 1997 05:06:43 -0600" References: <3386CBC3.88C37DBB@concentric.net>
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> > Nope, EIDE supports PIO mode 4 (16.6MB/sec) and DMA at about the same > > speed. 16.6MB/sec is standard for PCI EIDE controllers. Crufty SCSI > > PIO controllers are unlikely to be as fast. New Quantum EIDE drives > > support DMA at 33.3MB/sec. > > Now if only it worked that way In Real Life... :-) I have a pretty > decent Fijitsu drive, and my Quantum Lightning, which is among the worse > SCSI-II drives manufactered in the last couple of years, takes it to > town on every benchmark on the planet. I know the controller is crap, > but it was cheap, and I was just hoping. =) I have to disagree. I have a PPro-200 with a 1.7 GB Quantum FB, PIO mode. I get a sustained 6.8 MB/s on sequential read from this, while my Seagate Barracuda "only" gets around 6 MB/s. The price differential between SCSI and EIDE is significant enough these days that I think it's vital for FreeBSD to get EIDE DMA support. Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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