From owner-freebsd-hackers Sat May 24 06:25:15 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id GAA25000 for hackers-outgoing; Sat, 24 May 1997 06:25:15 -0700 (PDT) Received: from sos.freebsd.dk (sos.freebsd.dk [195.8.129.33]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id GAA24995 for ; Sat, 24 May 1997 06:25:11 -0700 (PDT) Received: (from sos@localhost) by sos.freebsd.dk (8.8.5/8.7.3) id PAA00586; Sat, 24 May 1997 15:25:31 +0200 (MEST) From: Søren Schmidt Message-Id: <199705241325.PAA00586@sos.freebsd.dk> Subject: Re: Controler for SCSI In-Reply-To: <25678.864473956@verdi.nethelp.no> from "sthaug@nethelp.no" at "May 24, 97 01:39:16 pm" To: sthaug@nethelp.no Date: Sat, 24 May 1997 15:25:31 +0200 (MEST) Cc: shag@concentric.net, hackers@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL30 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk In reply to sthaug@nethelp.no who wrote: > > > 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. So do I with my new Maxtor 84000A disks... > 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. Endeed, I plan to work on it (when I have some spare time, which is rare these days)... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team Even more code to hack -- will it ever end ..