Date: Thu, 15 Mar 2001 09:54:51 +1100 (EST) From: Iain Templeton <iain@research.canon.com.au> To: Alfred Perlstein <bright@wintelcom.net> Cc: chat@freebsd.org Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <Pine.LNX.4.10.10103150931040.3321-100000@blow.research.canon.com.au> In-Reply-To: <20010312151315.F18351@fw.wintelcom.net>
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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
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