From owner-freebsd-questions Fri Jan 14 0:45:10 2000 Delivered-To: freebsd-questions@freebsd.org Received: from isy.liu.se (isy.liu.se [130.236.48.10]) by hub.freebsd.org (Postfix) with ESMTP id 46C1114EE3 for ; Fri, 14 Jan 2000 00:45:08 -0800 (PST) (envelope-from mj@isy.liu.se) Received: from lagrange.isy.liu.se (lagrange.isy.liu.se [130.236.49.127]) by isy.liu.se (8.9.1/8.9.1) with ESMTP id JAA02213 for ; Fri, 14 Jan 2000 09:45:01 +0100 (MET) Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 Date: Fri, 14 Jan 2000 09:45:00 +0100 (CET) From: Micke Josefsson To: freebsd-questions@freebsd.org Subject: Expected SCSI speed question Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG I have a 200 MHz K6 system (FBSD 3.2), Adaptec 2940UW SCSI-adaptor and Seagate ST19171W Hard disk. The Seagate (Barracuda 9) disk is specced to up to 40 Mbytes/sec Max sync. SCSI transfer rate. But whatever tests I run (copying large files to and fro, dd from disk to /dev/null for example) the actual speed is never more than around 0.5 MB/s according to 'systat -io 1' or 'systat -vm 1'. Is there a knob to turn to speed it up or is this a bottleneck due to the processor? Cheers, Micke PS. I have used the same disk on a dual ppro 233MHz system, same SCSI-adaptor with about the same transfer speeds... ---------------------------------- Michael Josefsson, MSEE mj@isy.liu.se This message was sent by XFMail running on FreeBSD 3.1 ---------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message