Subject: Re: SCSI/disklabel questions
To: Michael Wolfson <email@example.com>
From: Ian Clark <firstname.lastname@example.org>
Date: 06/23/1998 21:34:22
On Mon, 22 Jun 1998, Michael Wolfson wrote:
> Hi folks, I've got a few burning questions.
> I recently got my hands on a reasonably fast SCSI-2 drive. On other
> platforms, I can get a sustained transfer rate of well over 3.5 MB/s on
> slow/narrow SCSI. On my 400s, the best I've ever seen is 700 KB/s (actual
> elapsed time, not processor time).
Hmm on my 380 I get :
68040 on-board scsi with Quantum LPS525S
happy:/usr/home/ic# time dd if=/dev/rsd0a of=/dev/null bs=8k count=1k
1024+0 records in
1024+0 records out
8388608 bytes transferred in 5 secs (1677721 bytes/sec)
5.52 real 0.02 user 1.09 sys
Of course the 400 scsi controller may be a completely different animal.
> Where does the slowdown come from: the SCSI hardware chipset in the 400,
> or the BSD drivers (i.e. will performance get better once people devote
> time to writing improved SCSI code)?
.. stuff about disklabels deleted that I can't comment on.
> -- MW
V TWINS: the only practical alternitive to the single :- Phil Irving
21 Year old Moto Morini, 16 year old Moto Guzzi, 23 year old car -
So what's the fuss about a couple of 10 year old workstations?
Ian Clark VK3KRI email@example.com http://www.deakin.edu.au/~ic/