From owner-freebsd-stable Tue Jun 18 3:43:23 2002 Delivered-To: freebsd-stable@freebsd.org Received: from mail.dt.e-technik.uni-dortmund.de (krusty.dt.E-Technik.Uni-Dortmund.DE [129.217.163.1]) by hub.freebsd.org (Postfix) with ESMTP id 1586F37B404 for ; Tue, 18 Jun 2002 03:43:17 -0700 (PDT) Received: from merlin.emma.line.org (localhost [127.0.0.1]) by mail.dt.e-technik.uni-dortmund.de (Postfix) with ESMTP id F0FBCA3831 for ; Tue, 18 Jun 2002 12:43:14 +0200 (CEST) Received: by merlin.emma.line.org (Postfix, from userid 500) id 519A52D18; Tue, 18 Jun 2002 12:43:11 +0200 (CEST) To: freebsd-stable@freebsd.org Subject: Re: ATA Atapi 4.6 Release References: <20020617205033.72524.qmail@web13408.mail.yahoo.com> <20020617204825.GC25616@leviathan.inethouston.net> <20020617205033.72524.qmail@web13408.mail.yahoo.com> <5.1.0.14.2.20020617161607.02fc3958@popmail.ct.lodgenet.com> <20020617212929.GH25616@leviathan.inethouston.net> In-Reply-To: <20020617212929.GH25616@leviathan.inethouston.net> ("David W. Chapman Jr."'s message of "Mon, 17 Jun 2002 16:29:29 -0500") From: Matthias Andree Date: Tue, 18 Jun 2002 12:43:11 +0200 Message-ID: Lines: 36 User-Agent: Gnus/5.090007 (Oort Gnus v0.07) Emacs/21.1 (i686-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG "David W. Chapman Jr." writes: > On Mon, Jun 17, 2002 at 04:19:49PM -0500, John Prince wrote: >> Hello David >> >Is this the only other problem? >> I think instead of asking is this the only problem, we should be saying >> "How does this impact our existing Users?" > > And we can't get a full scope of how it is affecting our existing > users until we have a list of all the problems. ATA-related problems I am aware of: Known Problem: IBM DTLA-307045 (75 GXP series) + VIA 82C686 south bridge ("KT133") locks up on TCQ, times out and falls back to PIO. (I cannot try my onboard PDC-20265R because FreeBSD avoids TCQ on this chip.) Works, but slowly. 4-STABLE before MFC was fine in UDMA/66 with "TAGGED". Compatibility: (already reported) Linux 2.5 ATA ships with working tagged command queueing on Western Digital AC420400D (which looks like an IBM DJNA-352030 clone). FreeBSD does not dare use TCQ on this drive, and as I hacked up 4-STABLE in spring to try it, it locked up. (I have a dual-boot FreeBSD/Linux machine, so no worries about differing hardware.) Performance: Linux 2.4 and 2.5 ATA sub systems have higher troughput on sequential read than FreeBSD 4.6-RC ATA. Never looked for latency through the file system (and cannot, as the Linux 2.4.19-pre BSD FFS file system is hosed.) (OTOH, FreeBSD 4.6-RC SCSI -- at least the aic stuff with an Adaptec 2940 UW Pro -- has better throughput than Linux with my U160 drive.) -- Matthias Andree To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message