From owner-freebsd-scsi  Sun Jun  7 20:14:58 1998
Return-Path: <owner-freebsd-scsi@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id UAA15197
          for freebsd-scsi-outgoing; Sun, 7 Jun 1998 20:14:58 -0700 (PDT)
          (envelope-from owner-freebsd-scsi@FreeBSD.ORG)
Received: from pluto.plutotech.com (mail.plutotech.com [206.168.67.137])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA15110
          for <scsi@FreeBSD.ORG>; Sun, 7 Jun 1998 20:14:37 -0700 (PDT)
          (envelope-from gibbs@plutotech.com)
Received: from narnia.plutotech.com (narnia.plutotech.com [206.168.67.130])
	by pluto.plutotech.com (8.8.7/8.8.5) with ESMTP id VAA13557;
	Sun, 7 Jun 1998 21:14:34 -0600 (MDT)
Message-Id: <199806080314.VAA13557@pluto.plutotech.com>
X-Mailer: exmh version 2.0.1 12/23/97
To: jak@cetlink.net (John Kelly)
cc: "Justin T. Gibbs" <gibbs@plutotech.com>, scsi@FreeBSD.ORG
Subject: Re: buslogic problems 
In-reply-to: Your message of "Sun, 07 Jun 1998 23:22:07 GMT."
             <357b1f75.2360909@mail.cetlink.net> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Sun, 07 Jun 1998 21:10:01 -0600
From: "Justin T. Gibbs" <gibbs@plutotech.com>
Sender: owner-freebsd-scsi@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

>On Thu, 4 Jun 1998 14:33:02 -0600 (MDT), "Justin T. Gibbs"
><gibbs@narnia.plutotech.com> wrote:
>
>>You may want to try using the CAM SCSI patches.  You will need to use
>>2.2-stable sources, but CAM does provide a better driver for the BusLogic
>
>I tried the 980520 CAM on a Buslogic 445C VLB, and it's much slower.
>With the old scsi driver I can copy /usr/src/usr.sbin to another drive
>in 1 minute 35 seconds, but with CAM it took 2 minutes 15 seconds.  
>
>Both tests run on the same machine, before and after installing CAM.

Most likely the degradation is from using ordered tags.  Try this 
change around line 936 of sys/cam/scsi/scsi_da.c:

#if 0
                        if ((bp->b_flags & B_ORDERED) != 0
                         || (softc->flags & DA_FLAG_NEED_OTAG) != 0) {
                                softc->flags &= ~DA_FLAG_NEED_OTAG;
                                softc->ordered_tag_count++;
                                tag_code = MSG_ORDERED_Q_TAG;
                        } else {
                                tag_code = MSG_SIMPLE_Q_TAG;
                        }
#else
                        tag_code = MSG_SIMPLE_Q_TAG;
#endif

--
Justin



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-scsi" in the body of the message