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From: jcurtis@simasd.uucp (Jay Curtis)
Newsgroups: comp.periphs.scsi
Subject: Re: Low disk throughput on Xenix 2.3.2/
Message-ID: <1991Mar21.055200.29525@simasd.uucp>
Date: 21 Mar 91 05:52:00 GMT
References: <20092@simasd.uucp> <283400078@adaptx1>
Organization: Commander Naval Surface Force Pacific
Lines: 37

In article <283400078@adaptx1> neese@adaptx1.UUCP writes:
>
>>	I am having a problem with SCO Xenix 2.3.2GT and very low disk
>>transfer rates.  Here is my configuration:
(stuff deleted)

>>With this config, I am only able to get 124K Bytes/sec. throughput under
>>Xenix.  Under Dos I get 496 K Bytes/sec.  Under ISC Unix, similar rates
>>to Dos.  Is there a known problem with the scsi drivers under Xenix?
>>Why would throughput be so low?  Running the same config except for the
>>drives and controller (substitue in a wd1003 controller and Maxtor 2190)
>>gave me double the disk throughput.  Why???
>
>Get the xnx252 driver from SCO or adaptex.  You will see a performance gain.
>You could also check to see of the read ahead cache is enabled in the drive
>via SCSICNTL.  If it isn't, try enabling it.
>
I am sorry.  I forgot to tell you that the 124K was with xnx252
installed!  Also the read ahead cache is enabled.  I am in ASYNC mode as
the other drive on the host adapter does not support SYNC transfers.
When I tried enabling SYNC on the host adapter, the system would hang on
bootup.

Any other ideas?  This is making me crazy!

>			Roy Neese
>			Adaptec Senior SCSI Applications Engineer
>			UUCP @  neese@adaptex
>				uunet!cs.utexas.edu!utacfd!merch!adaptex!neese


--Jay
-- 
Jay Curtis  
jcurtis@baron.UUCP	
{nosc;ncr-sd;ucsd;}!baron!jcurtis
Of course my opinions are my own... Who would let me speak for them?!