From owner-cvs-all Wed Oct 24 12: 0:47 2001 Delivered-To: cvs-all@freebsd.org Received: from flood.ping.uio.no (flood.ping.uio.no [129.240.78.31]) by hub.freebsd.org (Postfix) with ESMTP id DAC9037B40E; Wed, 24 Oct 2001 12:00:34 -0700 (PDT) Received: by flood.ping.uio.no (Postfix, from userid 2602) id 82C0114C42; Wed, 24 Oct 2001 21:00:33 +0200 (CEST) X-URL: http://www.ofug.org/~des/ X-Disclaimer: The views expressed in this message do not necessarily coincide with those of any organisation or company with which I am or have been affiliated. To: Mike Silbersack Cc: , Subject: Re: cvs commit: src/sys/dev/ata ata-disk.c References: <20011024134810.C77798-100000@achilles.silby.com> From: Dag-Erling Smorgrav Date: 24 Oct 2001 21:00:33 +0200 In-Reply-To: <20011024134810.C77798-100000@achilles.silby.com> Message-ID: Lines: 24 User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii 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 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. DES -- Dag-Erling Smorgrav - des@ofug.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message