From owner-freebsd-hackers  Sun Jun  2 21:23:32 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id VAA02224
          for hackers-outgoing; Sun, 2 Jun 1996 21:23:32 -0700 (PDT)
Received: from mail.barrnet.net (mail.barrnet.net [131.119.246.7])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id VAA02212;
          Sun, 2 Jun 1996 21:23:24 -0700 (PDT)
Received: from Root.COM (implode.Root.COM [198.145.90.17]) by mail.barrnet.net (8.7.5/MAIL-RELAY-LEN) with ESMTP id VAA01471; Sun, 2 Jun 1996 21:23:22 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by Root.COM (8.7.5/8.6.5) with SMTP id VAA00278; Sun, 2 Jun 1996 21:22:23 -0700 (PDT)
Message-Id: <199606030422.VAA00278@Root.COM>
X-Authentication-Warning: implode.Root.COM: Host localhost [127.0.0.1] didn't use HELO protocol
To: Bruce Evans <bde@zeta.org.au>
cc: deborah@microunity.com, gusw@zedat.fu-berlin.de,
        freebsd-hackers@freebsd.org, gibbs@freebsd.org
Subject: Re: Adaptec 2940 U makes fatal bus resets! 
In-reply-to: Your message of "Mon, 03 Jun 1996 13:52:44 +1000."
             <199606030352.NAA22079@godzilla.zeta.org.au> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Sun, 02 Jun 1996 21:22:22 -0700
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>>void
>>ahc_scb_timeout(unit, ahc, scb)
>>...
>
>>			timeout(ahc_timeout, (caddr_t)scb, ( TOFACT * 2 * hz));
>
>2 seconds was already a lot.  The fatal problem is probably in poor handling
>of SCSI errors.

   It seems conceivable that certain types of failures that require a
recalibrate, or certain types of SCSI devices (like CDROM drives) that
need to spin up first could trigger an unnecessary timeout with it set
to only 2 seconds. It should probably be increased to at least 10 seconds,
but I'll defer to whatever Justin thinks is needed.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project