From owner-freebsd-scsi Fri Feb 12 08:04:09 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id IAA29332 for freebsd-scsi-outgoing; Fri, 12 Feb 1999 08:04:09 -0800 (PST) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id IAA29326 for ; Fri, 12 Feb 1999 08:04:06 -0800 (PST) (envelope-from mjacob@feral.com) Received: from localhost (mjacob@localhost) by feral.com (8.8.7/8.8.7) with ESMTP id IAA18542; Fri, 12 Feb 1999 08:03:52 -0800 Date: Fri, 12 Feb 1999 08:03:52 -0800 (PST) From: Matthew Jacob X-Sender: mjacob@feral-gw Reply-To: mjacob@feral.com To: "Kenneth D. Merry" cc: ANDREAS.KLEMM.AK@bayer-ag.de, scsi@FreeBSD.ORG Subject: Re: It%s not the write cache on 3.0-STABLE and not tagged comma In-Reply-To: <199902121602.JAA34641@panzer.plutotech.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Is read performance okay? Also what's "poor"? On Fri, 12 Feb 1999, Kenneth D. Merry wrote: > Matthew Jacob wrote... > > > > What was the problem? > > He is getting poor performance for sequential writes with a Seagate disk > under CAM. Write throughput to the disk is fairly erratic. (i.e., lots of > ups and downs) > > He has the problem under 2.2.7 with tagged queueing enabled, but not when > he disables tagged queueing. The problem occurs under 3.0 with or > without tagged queueing. > > I told him to disable write caching, since I have seen similar problems > when write caching is enabled, but that didn't seem to fix the problem. > > Any ideas? > > Ken > -- > Kenneth Merry > ken@plutotech.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message