Adaptec 154x Tuning for SCO Unix
John Maline
john at ticipa.ti.com
Thu Jun 28 23:16:12 AEST 1990
A recent thread here has discussed tuning some parameters in the Adaptec
154x driver in 386/ix. Is there an equivalent set of (administrator
accessible) parameters in SCO Unix?
I've tried enabling synchronous negotiation and increasing the DMA
transfer speed via the on-board jumpers. Neither showed any significant
change in my simple benchmark (aside from an I/O error when DMA was set
to 8 MB/s).
Background:
My simple I/O speed test was:
time dd if=/dev/root of=/dev/null bs=10240
results: time user sys
asynchronous (sync enb jumper off) 7:32.0 0.9 2:17.1
synchronous 7:29.3 1.2 2:09.7
synchronous, DMA=5.7 MB/s 7:29.3 1.0 2:10.1
I interpret these similar results to indicate that SCO's driver
overrides the jumpers in software (as the Adaptec 1542a manual implies
can be done on p 2-14). This doesn't explain the I/O error at 8MB/s,
though...
System Configuration:
AST 386/33, 10Mb RAM, Adaptec 1542a, Maxtor 4170S, root partn=129397K
SCO Open Desktop (Unix V.3.2.1)
Any help/info would be greatly appreciated.
Regards,
John Maline UUCP: john at ticipa@tilde.ti.com
Texas Instruments
PO Box 655012 M/S 3635 TI MSG: JWMX
Dallas, TX 75265 Voice: (214) 917-2245
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