From owner-freebsd-scsi Fri Dec 5 17:45:35 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id RAA03623 for freebsd-scsi-outgoing; Fri, 5 Dec 1997 17:45:35 -0800 (PST) (envelope-from owner-freebsd-scsi) Received: from gaia.coppe.ufrj.br (cisigw.coppe.ufrj.br [146.164.5.200]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id RAA03609 for ; Fri, 5 Dec 1997 17:45:28 -0800 (PST) (envelope-from jonny@coppe.ufrj.br) Received: (from jonny@localhost) by gaia.coppe.ufrj.br (8.8.8/8.8.8) id XAA25942; Fri, 5 Dec 1997 23:44:10 -0200 (EDT) (envelope-from jonny) From: Joao Carlos Mendes Luis Message-Id: <199712060144.XAA25942@gaia.coppe.ufrj.br> Subject: Re: AHC optimizations In-Reply-To: <199712052157.OAA27773@narnia.plutotech.com> from "Justin T. Gibbs" at "Dec 5, 97 02:57:38 pm" To: gibbs@narnia.plutotech.com (Justin T. Gibbs) Date: Fri, 5 Dec 1997 23:44:10 -0200 (EDT) Cc: freebsd-scsi@freebsd.org X-Mailer: ELM [version 2.4ME+ PL32 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi Justin, #define quoting(Justin T. Gibbs) // > I've read the manual for ahc(4), but could not find anything that // > could harm my configuration: // // Most likely what is happening is that the IBM drive is returning // QUEUE FULL or has some other queuing problem that causes either the // aic7xxx driver or the SCSI system to fail certain commands. Most // likely the error code isn't properly handling the situation and the // result is a panic. If you want to use tagged queuing with this drive, // you may want to run current and try a CAM kernel. This is a production machine that I still don't want to run current in it, but needs desperately more performance from disk. Do you think that just removing the AHC_TAGENABLE and leaving the others will solve the problem ? Also, do you know if there's a list of boards/disks combinations that work with tagged queueing ? In particular, would the 2940UW with Seagate Barracuda or Cheetah work ? Thanks for your answer, Jonny -- Joao Carlos Mendes Luis jonny@gta.ufrj.br +55 21 290-4698 jonny@coppe.ufrj.br Universidade Federal do Rio de Janeiro UFRJ/COPPE/CISI PGP fingerprint: 29 C0 50 B9 B6 3E 58 F2 83 5F E3 26 BF 0F EA 67