Xref: utzoo comp.unix.i386:5869 comp.unix.questions:22919 comp.sys.ibm.pc:52483
Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!purdue!iuvax!news!cartan!ndmath!nstar!larry
From: larry@nstar.UUCP (Larry Snyder)
Newsgroups: comp.unix.i386,comp.unix.questions,comp.sys.ibm.pc
Subject: Adaptec 1542A tuning of 386/ix 2.2 kernel
Keywords: Adaptec SCSI 2.2 kernel
Message-ID: <511696@nstar.UUCP>
Date: 13 Jun 90 23:12:45 GMT
Followup-To: poster
Organization: The Northern Star, Notre Dame, IN USA
Lines: 22

I recently upgraded from 386/ix 2.02 to 2.2 and am wondering
what I can do to get the best throughput out of my 1542/SCSI
drive/tape system..

The documentation mentions tuning space.c, but in /usr/include/sys/aha1540.h
are some parameters like:

#define AHA_BUSON       5
#define AHA_BUSOFF      9
#define AHA_DMASPEED    1       
#define AHA_NUM_MBOX    8    
#define AHA_RES_MBOX    2  

the only thing that I have changed is the AHA_DMASPEED from the default
of 5 MB (0) to 6.7 (1) - and was wondering if I should try changing some
of these other values and jumpering on the controller...


-- 
 Larry Snyder, Northern Star Communications, Notre Dame, IN 
     uucp: iuvax!ndmath!nstar!larry  -or-  larry@nstar
          Public Access Unix Site (219) 289-3745