From owner-freebsd-current Mon Nov 13 06:22:40 1995 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id GAA25385 for current-outgoing; Mon, 13 Nov 1995 06:22:40 -0800 Received: from who.cdrom.com (who.cdrom.com [192.216.222.3]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id GAA25371 for ; Mon, 13 Nov 1995 06:22:34 -0800 Received: from vanuata.dcs.gla.ac.uk (vanuata.dcs.gla.ac.uk [130.209.240.50]) by who.cdrom.com (8.6.12/8.6.11) with ESMTP id GAA06017 for ; Mon, 13 Nov 1995 06:22:21 -0800 Message-Id: <199511131422.GAA06017@who.cdrom.com> Received: from savage-gw.dcs.gla.ac.uk by vanuata.dcs.gla.ac.uk with LOCAL SMTP (PP); Mon, 13 Nov 1995 13:43:52 +0000 To: uhclem (Frank Durda IV) <@fw.ast.com:uhclem@nemesis> cc: current@freebsd.org Subject: Re: Disk I/O that binds In-reply-to: Your message of "Sun, 12 Nov 1995 13:13:00 +0700." Date: Mon, 13 Nov 1995 13:42:45 +0000 From: Simon Marlow Sender: owner-current@freebsd.org Precedence: bulk > My system where I have seen something that somewhat resembles his > description is a mixed IDE SCSI system, and when things bog, the hog > process and the binding process are both trying to get to the same > SCSI drive. The IDE is for swap and root and is idle during these events. > > And in answer to someone elses' question, there was no tape I/O or > CD-ROM I/O active during these events on either system. Only SCSI disk. Just a guess, but could this be caused by the disk request sorting done by FreeBSD? New requests get entered into the queue possibly before old ones, and it could be a long time before a request finally gets serviced. Cheers, Simon -- Simon Marlow simonm@dcs.gla.ac.uk Research Assistant http://www.dcs.gla.ac.uk/~simonm/ finger for PGP public key