From owner-freebsd-hackers Thu Jun 5 15:48:36 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id PAA11809 for hackers-outgoing; Thu, 5 Jun 1997 15:48:36 -0700 (PDT) Received: from crh.cl.msu.edu (crh.cl.msu.edu [35.8.1.24]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id PAA11796 for ; Thu, 5 Jun 1997 15:48:23 -0700 (PDT) Received: (from henrich@localhost) by crh.cl.msu.edu (8.8.5/8.8.5) id SAA05889; Thu, 5 Jun 1997 18:48:13 -0400 (EDT) Message-ID: <19970605184813.26023@crh.cl.msu.edu> Date: Thu, 5 Jun 1997 18:48:13 -0400 From: Charles Henrich To: freebsd-hackers@freebsd.org Subject: Extremely poor interactive response under heave SCSI load Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.75 X-Operating-System: FreeBSD 2.2.2-RELEASE X-PGP-Fingerprint: 1024/F7 FD C7 3A F5 6A 23 BF 76 C4 B8 C9 6E 41 A4 4F Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Has anyone else noticed that a system with a large mount of unused (hence disk cache) ram while under heavy SCSI load (or not so heavy really, e.g: tar tvf crh.tgz > /tmp/crh.tgz.ls) causes interactive response to go into the toilet, and any other disk I/O takes an eternity to complete? For example, when doing that tar tvf of a 650mb file, it took over 30 seconds for mutt to load and run, any operation that hit disk was delayed at least 30 seconds.. Any ideas on a rememdy/tunable for this? (Im using an adaptec 2940) -Crh Charles Henrich Michigan State University henrich@msu.edu http://pilot.msu.edu/~henrich