From owner-freebsd-questions Thu Aug 31 19:55:49 2000 Delivered-To: freebsd-questions@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id 5EED037B424 for ; Thu, 31 Aug 2000 19:55:45 -0700 (PDT) Received: (from grog@localhost) by wantadilla.lemis.com (8.11.0/8.9.3) id e812tbx08293; Fri, 1 Sep 2000 12:25:37 +0930 (CST) (envelope-from grog) Date: Fri, 1 Sep 2000 12:25:36 +0930 From: Greg Lehey To: John Turner , freebsd-questions@FreeBSD.ORG Subject: Re: Tagged Queueing question Message-ID: <20000901122536.B5586@wantadilla.lemis.com> References: <4.3.2.7.0.20000830083308.00b197f8@mail.johnturner.com> <20000831104349.E29115@wantadilla.lemis.com> <20000831131350.F2264@absinthe.condo.chico.ca.us> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <20000831131350.F2264@absinthe.condo.chico.ca.us>; from fred@condo.chico.ca.us on Thu, Aug 31, 2000 at 01:13:50PM -0700 Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thursday, 31 August 2000 at 13:13:50 -0700, Fred Condo wrote: > 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. This is a separate issue. Yes, some drives have broken tagged queueing. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message