From owner-freebsd-current Tue Sep 9 11:34:26 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id LAA26085 for current-outgoing; Tue, 9 Sep 1997 11:34:26 -0700 (PDT) Received: from usr04.primenet.com (tlambert@usr04.primenet.com [206.165.6.204]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id LAA26054 for ; Tue, 9 Sep 1997 11:34:20 -0700 (PDT) Received: (from tlambert@localhost) by usr04.primenet.com (8.8.5/8.8.5) id LAA28493; Tue, 9 Sep 1997 11:34:14 -0700 (MST) From: Terry Lambert Message-Id: <199709091834.LAA28493@usr04.primenet.com> Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) To: mal@algonet.se (Mats Lofkvist) Date: Tue, 9 Sep 1997 18:34:13 +0000 (GMT) Cc: tlambert@primenet.com, current@FreeBSD.ORG In-Reply-To: <199709091225.OAA14331@kairos> from "Mats Lofkvist" at Sep 9, 97 02:25:42 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-freebsd-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > But can lack of tagged command queueing explain the combination of good > performance unloaded and bad with one or more cpu bound processes? Yes, I believe so: swapping. But you need to know for sure if it is supported in your version, and I'm not the one to ask. Look at the archives, or wait for Stefan to post. > I have no problem with issues with the 810a affecting devices connected > to it, but is it probable it could affect devices connected to the adaptec? No. The problems were specific to the 810a. > PS How do I find out if tagged queueing is supported? Maybe time > to try -current? Look in the archives or look in the archives to get Stefan's address, and ask him. Or if you CVSup/CTM code, look at the CVS logs. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.