Re: NEXTSTEP 3.3 patch, Adaptec 2940 and Command Queueing

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#1622

From: John Kheit
Date: Sun, 04 Feb 1996 01:30

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rdl@world.std.com (Robert La Ferla) wrote:
> Has anyone gotten this to work?  I have tried this with a few
> different configurations without success.  I am thinking that
> NeXT's driver is just broken.  I get system panics and corrupted
> disks (repairable via fsck)

> Configuration #1:

> Adaptec 2940N, Seagate ST12550N, NEC 4Xi

[snip]

>  Is it the case that all peripherals on the bus need to support
>  command queueing?

>  Also, how much of a benefit is command queueing anyhow?

I think you'll find that most CDROM's don't support CMND Queing
and that is likely the reason you cannot enable it.  If you take
off the CDROM and run just your HD with CMNDQ it will likely work.

The problem is that Adaptec's don't let you individually turn off
CMNDQ for each item on the SCSI bus; not to even mention negotiating
optimally with each device (as do DPT controllers).  So it is an
all or nothing proposition with adaptecs...

Fortunatly I have found the difference in performance to be
non-existent, so it's no big deal...
--
Thanks, take care, later, John Kheit   )^>   %^)   =^)

monoChrome, Inc.            | New York Law School
NEXTSTEP Developer          | Opinions expressed represent me only
MIME & NeXTmail OK--PPP     | http://cnj.digex.net/~jkheit
mailto:jkheit@cnj.digex.net | Telepathy...It's coming...

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Path: arc1-ca.pugleaf.net!news3.digex.net!usenet
From: John Kheit <jkheit@cnj.digex.net>
Newsgroups: comp.sys.next.hardware,comp.periphs.scsi,comp.sys.next.bugs
Subject: Re: NEXTSTEP 3.3 patch, Adaptec 2940 and Command Queueing
Date: 4 Feb 1996 01:30:04 GMT
Organization: monoChrome, Inc.
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