From owner-freebsd-hardware Mon Apr 20 10:01:40 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id KAA10583 for freebsd-hardware-outgoing; Mon, 20 Apr 1998 10:01:40 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from dingo.cdrom.com (dingo.cdrom.com [204.216.28.145]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id RAA10436 for ; Mon, 20 Apr 1998 17:01:03 GMT (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost [127.0.0.1]) by dingo.cdrom.com (8.8.8/8.8.5) with ESMTP id JAA00786; Mon, 20 Apr 1998 09:56:56 -0700 (PDT) Message-Id: <199804201656.JAA00786@dingo.cdrom.com> X-Mailer: exmh version 2.0zeta 7/24/97 To: Karl Pielorz cc: Mike Smith , hardware@FreeBSD.ORG Subject: Re: best wdc0 flags ? In-reply-to: Your message of "Mon, 20 Apr 1998 17:42:20 BST." <353B7AEC.D560BAD7@tdx.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 20 Apr 1998 09:56:56 -0700 From: Mike Smith Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > Mike Smith wrote: >> >>>>>> I tried those flags and noticed that it turned on 32-bit transfers for >>>>>>my wd0, resulting in a 20% increase in throughput. Out of curiosity, why >>>>>>aren't these flags included in GENERIC? >>>>> >>>>> Becuase they break operation of drives that don't support them. >>>> >>>>Do we have any examples of controllers that don't? >>> >>> I thought I did, but my oldest accessible drive (all 400MB of it from >>> 4 years ago) supports them. The probe seems to handle any that don't. >> >> OK. Should we make it the default then? > > Not a good idea... 32 bit transfers cause my nice shiny new Fireball 4.3Gb > SE's to barf (this is on a 440FX chipset 'embeded' controller). Have you tried enabling DMA? (0xa0ffa0ff) Also check your BIOS configuration to make sure that the disks are set up correctly (PIO mode, etc.) > A bit annoying - but probably expected from Quantum... Not really. They *ought* to work - certainly we're seeing 32-bit transfers working on other SE-series drives just fine. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message