From owner-freebsd-current  Thu Apr  9 10:25:49 1998
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id KAA11614
          for freebsd-current-outgoing; Thu, 9 Apr 1998 10:25:49 -0700 (PDT)
          (envelope-from owner-freebsd-current@FreeBSD.ORG)
Received: from slip-3 (mail@slip-3.slip.net [207.171.193.17])
          by hub.freebsd.org (8.8.8/8.8.8) with SMTP id KAA11608
          for <freebsd-current@freebsd.org>; Thu, 9 Apr 1998 10:25:46 -0700 (PDT)
          (envelope-from thomma@slip.net)
Received: from thomma by slip-3 with local (Exim 1.62 #4)
	id 0yNL4b-0002IT-00; Thu, 9 Apr 1998 10:25:13 -0700
Subject: FAILSAFE and NCR
To: freebsd-current@FreeBSD.ORG
Date: Thu, 9 Apr 1998 10:25:08 -0700 (PDT)
X-Mailer: ELM [version 2.4 PL25]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Message-Id: <E0yNL4b-0002IT-00@slip-3>
From: Tamiji Homma <thomma@slip.net>
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Hi,

I posted about SCSI disk performance difference(three times)
between 19980222-SNAP and 19971006-SNAP.  It turned out to be
the FAILSAFE option made the difference.  It slows SCSI disk
access down significantly.

Thanks to Geoff Buckingham and John Dyson, I could dig into
a little deeper. 

I noticed that MAX_START is now hardcoded to 32, which used 
to be (MAX_TARGET + 7 * SCSI_NCR_DFLT_TAGS) in sys/pci/ncr.c.

Is this going to be this way from now on?  Or is it anything
to do with CAM?  So that it will be resolved differently?

It is a little annoying everytime I have to patch sys/pci/ncr.c.

Thanks

Tammy

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