From owner-freebsd-stable Thu Feb 20 0:47:12 2003 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C808537B401; Thu, 20 Feb 2003 00:47:10 -0800 (PST) Received: from cain.gsoft.com.au (genesi.lnk.telstra.net [139.130.136.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1160943F3F; Thu, 20 Feb 2003 00:47:08 -0800 (PST) (envelope-from doconnor@gsoft.com.au) Received: from [127.0.0.1] (localhost [127.0.0.1]) by cain.gsoft.com.au (8.12.4/8.12.6) with ESMTP id h1K8l3js067770; Thu, 20 Feb 2003 19:17:03 +1030 (CST) (envelope-from doconnor@gsoft.com.au) X-Authentication-Warning: cain.gsoft.com.au: Host localhost [127.0.0.1] claimed to be [127.0.0.1] Subject: Curious SCSI and/or Firewire Problem From: "Daniel O'Connor" To: FreeBSD Stable List Cc: freebsd-scsi@freebsd.org Content-Type: text/plain Organization: Message-Id: <1045730822.40318.19.camel@chowder.gsoft.com.au> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 Date: 20 Feb 2003 19:17:03 +1030 Content-Transfer-Encoding: 7bit X-Spam-Score: 1.1 (*) CARRIAGE_RETURNS,SPAM_PHRASE_00_01 X-Scanned-By: MIMEDefang 2.16 (www . roaringpenguin . com / mimedefang) Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I am testing a firewire enclosure and a SCSI card. The SCSI card is an Init-IO 940/950 and I obtained a driver from someone who back ported it from OpenBSD (hopefully it will be committed soon :) I notice that the firewire enclosure does ~20-25Mb/sec by itself, and the SCSI disk (old slow 1Gb) does 4.5Mb/sec by itself. If I run them both they act very bursty - neither runs at full usage all of the time, or at top speed. These measurement are made with 'systat -vmstat 1'. It is almost as if they are blocking each other in the kernel, but I'm not sure. My disk exerciser consists of dd'ing from /dev/zero into a file on the disks. The machine is running 4.7 from a few days ago. Anyone have any ideas what it could be? I haven't tried it with the IDE disk that is on this system yet. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 9A8C 569F 685A D928 5140 AE4B 319B 41F4 5D17 FDD5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message