home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mcsun!uknet!gdt!aber!aberfa!pcg
- From: pcg@aber.ac.uk (Piercarlo Grandi)
- Newsgroups: comp.arch
- Subject: Re: BUSES
- Message-ID: <PCG.92Jul30161451@aberfb.aber.ac.uk>
- Date: 30 Jul 92 16:14:51 GMT
- References: <1992Jul23.092211.18462@nuscc.nus.sg> <1992Jul23.191927.1181@pcnntp.apple.com>
- <1992Jul27.191347.4485@ksmith.uucp> <33751@cbmvax.commodore.com>
- Sender: news@aber.ac.uk (USENET news service)
- Reply-To: pcg@aber.ac.uk (Piercarlo Grandi)
- Organization: Coleg Prifysgol Cymru
- Lines: 43
- In-Reply-To: jesup@cbmvax.commodore.com's message of 29 Jul 92 02: 25:59 GMT
- Nntp-Posting-Host: aberfb
-
-
- On 29 Jul 92 02:25:59 GMT, jesup@cbmvax.commodore.com (Randell Jesup) said:
-
- jesup> keith@ksmith.uucp (Keith Smith) writes:
-
- keith> Is it not also true however, that the current disk devices can't even
- keith> swamp an ISA bus? The average desktop doesn't have multiple striped
- keith> disks and whatnot.
-
- jesup> Sure they can. A single 3.5" drive can sustain 4.2MB/s. With a
- jesup> couple (or even maybe 1) of those, I think an AT bus would get
- jesup> pretty crowded...
-
- The old tirade! Do you think the "average desktop" has got the new
- superfast/superspinning/4.2MB/s drives?
-
- Of several dozen workstations at this site, very few have disks at
- all... This seems typical.
-
- It is always possible to find counterexample at the high end, but most
- buses are not designed for the highest possible performing workstations,
- they are most often designed for what 80% of the people are prepared to
- pay for. Engineering means doing a decent job at a low cost.
-
- If everybody could afford FB+/IPI/>5400RPM subsystems everybody would be
- happier. Unfortunately "average desktop"s are endowed with a single
- $1000/300MB/3.5" or $1500/600MB/5.25" drive that does 1.5MB/s sustained.
-
- My own home machine, which is larger than the average desktop (at least
- on this side of the Pond), has got two such drives and a 2MB/s VGA
- board, and I am very far away from bumping into the limits of the ISA
- bus. In practice the "average desktop" has got a single SCSI-1 host
- adapter, and indeed I would suggest that the ISA bus is perfectly
- adequate for all those setups that aren't/wouldn't be bottlenecked by a
- single SCSI-1 bus; these are, as of now, the vast majority.
-
- Clearly people who need to do real time TV, for example, need much
- faster disks and much faster video cards, but they don't use "average
- desktop"s.
- --
- Piercarlo Grandi | ARPA: pcg%uk.ac.aber@nsfnet-relay.ac.uk
- Dept of CS, UCW Aberystwyth | UUCP: ...!mcsun!ukc!aber-cs!pcg
- Penglais, Aberystwyth SY23 3BZ, UK | INET: pcg@aber.ac.uk
-