Path: utzoo!utgpu!watmath!att!dptg!rutgers!usc!cs.utexas.edu!uunet!ncrlnk!ncr-sd!tw-rnd!johnl
From: johnl@tw-rnd.SanDiego.NCR.COM (John Lindwall)
Newsgroups: comp.sys.amiga
Subject: How to measure disk speed
Keywords: help hard disk speed measure
Message-ID: <473@tw-rnd.SanDiego.NCR.COM>
Date: 8 Aug 89 01:40:09 GMT
Organization: NCR Distributed Systems Laboratory
Lines: 25

I have a Quantum 80S, Supra 4x4 controller on my A1000.  I wanted disk
performance figures and so I ran diskperf3.0 and perftest.  With diskperf
I get between 200K/sec reads and 90K/sec writes all the way up to 280K/sec
reads and 150K/sec writes.  Perftest results were 200K/sec reads and
85K/sec writes.

What is the purpose for having the multiple buffer runs in diskperf?
If I want to gain the greatest speed am I supposed to up my buffers in the
mountlist (or SupraEdit screen)?  I don't want to waste 32K for a large
buffer for such a small increase.

When Supra quotes 326K/sec (on the A500 interface in their full page ads in
AmigaWorld) do they use disperf or what?  I assume they kludge it to get
the best results (buffers = 100K?!? maybe).

A question for Supra owners: has anyone tried to up the MaxTransfer value?
The Supra software sets it to 64K, but I believe a larger number (or none if
possible) would provide faster performance.  Is it reliable?

Thanks for listening to my rambles.


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	"Above opinions are my own, not my employer's"
John Lindwall				 johnl@tw-rnd.SanDiego.NCR.COM