From owner-cvs-all Wed Oct 24 19: 5:32 2001 Delivered-To: cvs-all@freebsd.org Received: from leviathan.inethouston.net (leviathan.inethouston.net [66.64.12.249]) by hub.freebsd.org (Postfix) with ESMTP id 1E32637B401; Wed, 24 Oct 2001 19:05:21 -0700 (PDT) Received: by leviathan.inethouston.net (Postfix, from userid 1001) id BD15310F40E; Wed, 24 Oct 2001 21:05:26 -0500 (CDT) Date: Wed, 24 Oct 2001 21:05:26 -0500 From: "David W. Chapman Jr." To: Dag-Erling Smorgrav Cc: Mike Silbersack , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/ata ata-disk.c Message-ID: <20011024210526.C70640@leviathan.inethouston.net> Reply-To: "David W. Chapman Jr." Mail-Followup-To: Dag-Erling Smorgrav , Mike Silbersack , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org References: <20011024134810.C77798-100000@achilles.silby.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.23i X-Operating-System: FreeBSD 4.4-STABLE i386 Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wed, Oct 24, 2001 at 09:00:33PM +0200, Dag-Erling Smorgrav wrote: > Mike Silbersack writes: > > Why are we changing this again? It was turned back on because without > > write caching many people reported huge slowdowns. Has there since been > > an influx of reports of huge losses of data on all versions other than > > 4.3? > > Please look at the diff. It does not change the default value of the > hw.ata.wc tunable (which, BTW, is still 0 in -CURRENT); it just fixes > a bug where write cacheing would sometimes be incorrectly enabled even > when the hw.ata.wc was set to 0. This is the correct behaviour for > devices that support tagged queuing, but not for those that do not. > > (I wish people would make a rule of checking the diff before hitting > "reply" to criticize a commit...) > > > (Should I bring up the irony of the tagged-queueing IBM drives having a > > high failure rate? ) > > Only 75GXPs, AFAIK. They were pulled from the market in Norway, > though not, I've been told, in many other countries. > You can still get them in America. -- David W. Chapman Jr. dwcjr@inethouston.net Raintree Network Services, Inc. dwcjr@freebsd.org FreeBSD Committer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message