Date: Wed, 31 Jan 2001 12:30:41 -0800
From: Mike Smith <msmith@freebsd.org>
To: mjacob@feral.com
Cc: Dag-Erling Smorgrav <des@ofug.org>, Dan Nelson <dnelson@emsphone.com>, Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>, arch@FreeBSD.ORG
Subject: Re: Bumping up {MAX,DFLT}*PHYS (was Re: Bumping up {MAX,DFL}*SIZ in i386)
Message-ID: <200101312030.f0VKUfW00945@mass.dis.org>
In-Reply-To: Your message of "Wed, 31 Jan 2001 12:23:11 PST." <Pine.BSF.4.21.0101311222230.27098-100000@beppo.feral.com>
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>
> What do you mean for ISA? I thought you could do a lot more.
>
> Anyway, I mean, get real... PCI has been the main bus now for some years and
> it can do a full 32 bits.... let's move on now, please...
PCI DMA engines are still pretty sucky. In most cases though, 128K is a
sensible size to be wiring for a single transfer; remember that most
decent controllers will let you have a nontrivial number of outstanding
transfers posted simultaneously.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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