From owner-freebsd-questions Thu Aug 31 13:14:14 2000 Delivered-To: freebsd-questions@freebsd.org Received: from absinthe2.dyndns.org (adsl-63-192-100-24.dsl.chic01.pacbell.net [63.192.100.24]) by hub.freebsd.org (Postfix) with ESMTP id 1E31D37B42C for ; Thu, 31 Aug 2000 13:14:02 -0700 (PDT) Received: (from fred@localhost) by absinthe2.dyndns.org (8.9.3/8.9.3) id NAA03598; Thu, 31 Aug 2000 13:13:50 -0700 (PDT) (envelope-from fred) Date: Thu, 31 Aug 2000 13:13:50 -0700 From: Fred Condo To: Greg Lehey Cc: John Turner , freebsd-questions@FreeBSD.ORG Subject: Re: Tagged Queueing question Message-ID: <20000831131350.F2264@absinthe.condo.chico.ca.us> Mail-Followup-To: Greg Lehey , John Turner , freebsd-questions@FreeBSD.ORG References: <4.3.2.7.0.20000830083308.00b197f8@mail.johnturner.com> <20000831104349.E29115@wantadilla.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20000831104349.E29115@wantadilla.lemis.com>; from grog@lemis.com on Thu, Aug 31, 2000 at 10:43:49AM +0930 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Aug 31, 2000 at 10:43:49AM +0930, Greg Lehey wrote: > On Wednesday, 30 August 2000 at 8:35:41 -0400, John Turner wrote: > > > > This message showed up in one my server's security check output > > today. I've never seen it before. Is it something I need to worry > > about? The server was rebooted yesterday, after about 2 months of uptime. > > > >> da1 at ahc0 bus 0 target 2 lun 0 > >> da1: Fixed Direct Access SCSI-3 device > >> da1: 80.000MB/s transfers (40.000MHz, offset 30, 16bit), Tagged Queueing Enabled > >> da1: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) > > Tagged queueing is a technique where the driver issues multiple > requests to the controller, and the controller automatically continues > with the next request after finishing the first, without needing > intervention by the driver. This improves performance. There's > nothing to worry about. Unless you have certain seagate drives. There was a discussion of seagate firmware bugs recently on -questions or -stable. That bug bit me until I disabled write-through on the scsi bios and used camcontrol to turn off tagged queueing at boot time. The original questioner's IBM drive should be okay AFAIK. -- Fred Condo + fred@condo.chico.ca.us Not since Tom Hanks won an Oscar has there been that much acting in Philadelphia. -- Sen. Joe Lieberman, about the Republican Convention. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message