Simple disk performance test.

[Larry Pajakowski]

We just got a Compaq-386/20 with the Compaq 130mb. disk.
I did a crude measure of disk performance on the Comaq under SCO Xenix-286
2.2.1 (Xenix 386 is waiting on some Excelan drivers).  I also did the
measurements on an IBM PC/AT at 8mhz with the stock CMI drive.

Yes I know that more than just the machine is being test here but that is the
whole point.

The measurement consisted of:

   time dd if=/large_file of=/dev/null bs=30k		#for file reads

   time dd if=/dev/rhdxx of=/dev/null bs=30k		# for raw reads


               Raw Reads             File Reads

Compaq         550K/sec.             220K/sec.

PC/AT          120K/sec.              26K/sec.

All the factors (1:1 interleave, ESDI, 20mhz. processor, fast seek times)
really add up to impresive performance.  This generally agrees with the
overall feel of the machine.

Perhaps others could post the results of like tests on other machines and
software combinations.  It would make an interesting comparison.