From owner-freebsd-chat Wed Mar 14 14:55: 8 2001 Delivered-To: freebsd-chat@freebsd.org Received: from kwanon.research.canon.com.au (kwanon.research.canon.com.au [203.12.172.254]) by hub.freebsd.org (Postfix) with ESMTP id 51A2C37B73A for ; Wed, 14 Mar 2001 14:54:55 -0800 (PST) (envelope-from iain@research.canon.com.au) Received: from bellmann.research.canon.com.au (bellmann.research.canon.com.au [10.5.0.3]) by kwanon.research.canon.com.au (Postfix) with ESMTP id 6D75AA4B21; Wed, 14 Mar 2001 23:06:56 +0000 (UTC) Received: from elph.research.canon.com.au (elph.research.canon.com.au [203.12.174.253]) by bellmann.research.canon.com.au (Postfix) with ESMTP id 1B7588B10; Thu, 15 Mar 2001 09:44:45 +1100 (EST) Received: from blow.research.canon.com.au (blow.research.canon.com.au [10.8.1.4]) by elph.research.canon.com.au (Postfix) with ESMTP id E231E3C1; Thu, 15 Mar 2001 09:54:44 +1100 (EST) Date: Thu, 15 Mar 2001 09:54:51 +1100 (EST) From: Iain Templeton Reply-To: chat@freebsd.org To: Alfred Perlstein Cc: chat@freebsd.org Subject: Re: Disk I/O problem in 4.3-BETA In-Reply-To: <20010312151315.F18351@fw.wintelcom.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, 12 Mar 2001, Alfred Perlstein wrote: [redirected to -chat, hopefully] > > It's actually worse. Someone, I forget who, ran some tests with > > write-caching turned on and found that the IDE drive could hold a > > pending write in its cache 'forever', even in the face of other writes, > > as long as there was other disk activity going on. So we aren't just > > talking about issuing I/O's out of order, we are talking about issuing > > a sequence of writes and having some of them simply not ever commiting > > to disk (not for a long, long time) in a heavily loaded environment. > > That's bad news. > > Someone leaked the Linux austrailian elevator algorithm to the disk > manufacturers? > As an elevator user in Australia I'm intrigued by this comment? I know our elevators at work can play up ("No I said up to the 5th, not down to B1!"). Iain To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message