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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