Adaptec 1542 Kernel tuning with 386/ix
0000-Admin0000
root at maxed
Sat Jul 7 02:46:01 AEST 1990
In article <PCG.90Jul5152829 at odin.cs.aber.ac.uk> pcg at cs.aber.ac.uk (Piercarlo Grandi) writes:
>
>In article <1990Jul04.123903.3204 at nstar.uucp> larry at nstar.uucp (Larry
>Snyder) writes:
>
> behm at zds-ux.UUCP (Brett Behm) writes:
>
> >I really do not know what to make of these results.
>All over I see transfer rates around 300K per second. If they are thru
>the filesystem it is not too bad, but I had expected better from
>AHA1542, HPDD, and FFS. Something more like 500-600 KB/sec.
The BYTE UNIX Benchmarks do a 'thru the filesystem' test that is
more illuminating, although the variance is high. I get the following
with the Adaptec AHA 1542A on a 33MHz machine running ISC 2.2:
=============================================================================
Filesystem Throughput Test:
-----------------------------------------------------------------------------
Test Time: 1 secs
Arithmetric Geometric Variance
Mean Mean (6 tests)
Read (Kbytes/sec): 2617 2050 1358965.47
Write (Kbytes/sec): 280 25 433628.17
Copy (Kbytes/sec): 1004 1000 9398.17
-----------------------------------------------------------------------------
Test Time: 10 secs
Arithmetric Geometric Variance
Mean Mean (6 tests)
Read (Kbytes/sec): 533 472 51605.47
Write (Kbytes/sec): 428 408 17707.07
Copy (Kbytes/sec): 339 336 2618.67
-----------------------------------------------------------------------------
Test Time: 20 secs
Arithmetric Geometric Variance
Mean Mean (6 tests)
Read (Kbytes/sec): 715 714 1740.27
Write (Kbytes/sec): 505 505 164.67
Copy (Kbytes/sec): 354 354 190.17
This is for the stock 5 MHz DMA and other parameters. I guess the
variance is the result of the operating system buffering, which
is especially quirky on short tests.
--
Ed Whittemore uunet!maxed!ed
American Micro Group 201 944 3293
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