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Date:      Thu, 30 Jan 2003 09:51:28 -0800
From:      David Schultz <dschultz@uclink.berkeley.edu>
To:        Terry Lambert <tlambert2@mindspring.com>
Cc:        "Andrew R. Reiter" <arr@watson.org>, Scott Long <scott_long@btc.adaptec.com>, arch@FreeBSD.ORG
Subject:   Re: PAE (was Re: bus_dmamem_alloc_size())
Message-ID:  <20030130175128.GA9891@HAL9000.homeunix.com>
In-Reply-To: <3E3922DA.55D9CDE9@mindspring.com>
References:  <Pine.NEB.3.96L.1030129153953.13361A-100000@fledge.watson.org> <3E385A1E.629EB694@mindspring.com> <20030130064800.GB7258@HAL9000.homeunix.com> <3E3922DA.55D9CDE9@mindspring.com>

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Thus spake Terry Lambert <tlambert2@mindspring.com>:
> David Schultz wrote:
> > Thus spake Terry Lambert <tlambert2@mindspring.com>:
> > > "Andrew R. Reiter" wrote:
> > > > Anyone know the status of PAE in fBSD?  I heard rumors awhile back that
> > > > people had patches, or Y! had patches... but has anyone actually coughed
> > > > them up?
> > >
> > > Contact Paul Saab.
> > 
> > A year ago, the rumor was that DG was eventually going to do it.
> > Six months ago it was Peter Wemm.  And now Paul Saab?!  Sheesh.
> > Why don't we just wait another few years so 64-bit machines solve
> > all our problems and we don't have to hack up the VM system?  ;-)
> 
> PSE36 is more intelligent than PAE, but neither one are very smart;
> they were put there by hardware people who thought that what software
> people wanted was more processes in RAM, not more RAM in individual
> processes.  As such, they are a generally bad idea.  Most people
> asking the question seem to have bought into the hardware people's
> picture of the universe, without understanding that.  8-(.

More specifically, they are the same people who brought us bank
switching at least twice in the past, and lo and behold it still
isn't a very good idea.

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