Date: Wed, 24 Oct 2001 21:05:26 -0500 From: "David W. Chapman Jr." <dwcjr@inethouston.net> To: Dag-Erling Smorgrav <des@ofug.org> Cc: Mike Silbersack <silby@silby.com>, 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> In-Reply-To: <xzpr8rsyib2.fsf@flood.ping.uio.no> References: <20011024134810.C77798-100000@achilles.silby.com> <xzpr8rsyib2.fsf@flood.ping.uio.no>
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On Wed, Oct 24, 2001 at 09:00:33PM +0200, Dag-Erling Smorgrav wrote: > Mike Silbersack <silby@silby.com> 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? <g>) > > 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. <www.inethouston.net> dwcjr@freebsd.org FreeBSD Committer <www.FreeBSD.org> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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