Date: Tue, 25 Aug 1998 05:36:44 +0000 From: Mike Smith <mike@smith.net.au> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: john hood <cgull@owl.org>, Joe Gleason <freebsd.list@bug.tasam.com>, freebsd-hardware@FreeBSD.ORG Subject: Re: UDMA Support Message-ID: <199808250536.FAA00441@dingo.cdrom.com> In-Reply-To: Your message of "Tue, 25 Aug 1998 15:59:13 %2B0930." <199808250629.PAA06960@cain.gsoft.com.au>
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> > > > FreeBSD 3.0 supports IDE DMA. SCSI disks will give better performance > > > in multiple-disk or high load scenarios. > > -current supports DMA, but not Ultra DMA, which is faster and has > > CRC error checking. (I haven't got an Ultra DMA motherboard and > > drive to code/debug on.) This is not much of a problem yet, as > > IDE drives cannot yet use all the bandwidth of standard DMA, but > > it looks like it will be soon, the way IDE drives are going. :) > And the less time the computer spends moving data off your HD means more > time to render Quake frames (or something). > > I have a UDMA mobo and 3 UDMA drives, so I can test it for you. I could > probably code some of it if I knew what to do =) (ie the UDMA spec) You want the ATA-4 spec (ftp://fission.dt.wdc.com) and the datasheet for the interface chipset you have (probably http:// developer.intel.com). -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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