Date: Wed, 24 Jan 2001 13:48:04 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Chris Dillon <cdillon@wolves.k12.mo.us> Cc: "Koster, K.J." <K.J.Koster@kpn.com>, "'Olivier Nicole'" <on@cs.ait.ac.th>, hardware@FreeBSD.ORG Subject: RE: Panic at setup time Message-ID: <Pine.BSF.4.21.0101241345370.7905-100000@beppo.feral.com> In-Reply-To: <Pine.BSF.4.21.0101241525560.65986-100000@mail.wolves.k12.mo.us>
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If you're getting an extra card, which is what I thought *you* were talking about, I was ssuming server, not desktop. The newer IBM drives can do tagged operations, and in any case, you have dual channels- whether it's slave or master, the quicker you burst the data, the better. If the whole xfer is on drive cache, you want to move it as quickly as possibly (for reads), or you want to fill the drive cache as quickly as possible. Your latter comment I don't disagree with. On Wed, 24 Jan 2001, Chris Dillon wrote: > On Wed, 24 Jan 2001, Matthew Jacob wrote: > > > "shared bus" is the hint here... > > Right, but it is only shared if you have more than one device on > it. :-) > > Most home/office systems only have one IDE HD and one IDE CDROM, and > if the system builder was smart, they put the HD on the primary > channel and the CDROM on the secondary channel, so you wouldn't be > sharing the busses. This was the type of system that I assume was > being talked about. Even if the CDROM were on the primary, an > ATA66/100 host interface wouldn't be any help in that situation, since > the fastest interface I've seen on any IDE CDROM drive to date is > ATA33. IIRC, that would cause the whole channel to revert to ATA33 > mode regardless if another device supported a faster mode, right? If > you had two modern HDs on the same channel that each supported ATA66 > or ATA100, then having an ATA66 or ATA100 host interface would be an > improvement over ATA33 if you planned on transferring a lot of data > to/from both drives simultaneously. Otherwise, it wouldn't make any > noticeable difference, IMHO. > > Basically what I'm trying to say is, just because a particular > motherboard only has an ATA33 interface is not necessarily a reason to > NOT buy it. That is why I made the comment in the first place. :-) > > > -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net > FreeBSD: The fastest and most stable server OS on the planet. > For IA32 and Alpha architectures. IA64, PPC, and ARM under development. > http://www.freebsd.org > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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