From owner-freebsd-current  Sat May  4 17:23:26 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id RAA21004
          for current-outgoing; Sat, 4 May 1996 17:23:26 -0700 (PDT)
Received: from precipice.shockwave.com (precipice.shockwave.com [171.69.108.33])
          by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id RAA20997
          Sat, 4 May 1996 17:23:24 -0700 (PDT)
Received: from shockwave.com (localhost.shockwave.com [127.0.0.1]) by precipice.shockwave.com (8.7.5/8.7.3) with ESMTP id RAA19015; Sat, 4 May 1996 17:22:43 -0700 (PDT)
Message-Id: <199605050022.RAA19015@precipice.shockwave.com>
To: "Justin T. Gibbs" <gibbs@freefall.freebsd.org>
cc: Bob Willcox <bob@luke.pmr.com>,
        freebsd-current@freefall.freebsd.org (freebsd-current)
Subject: Re: ahc driver no longer sees one of my disks 
In-reply-to: Your message of "Thu, 02 May 1996 21:39:07 PDT."
             <199605030439.VAA23683@freefall.freebsd.org> 
Date: Sat, 04 May 1996 17:22:41 -0700
From: Paul Traina <pst@shockwave.com>
Sender: owner-current@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


  From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org>
  Subject: Re: ahc driver no longer sees one of my disks 
  
  The driver uses DELAY() to perform the SCSI bus reset.  Perhaps its not
  long enough in your new system.  My other guess is that the bus settle
  delay isn't long enough.  What's the value of SCSIDELAY in your kernel?
  Is DELAY() really so dependant on the CPU speed?  Can we get a better
  DELAY() macro?

The delay macro, is by definition, processor speed independant.
If it changes significantly, then it's broken.