From owner-freebsd-sparc  Wed Jan 26  0: 4:37 2000
Delivered-To: freebsd-sparc@freebsd.org
Received: from bsd4us.org (cn386092-a.newcas1.de.home.com [24.40.46.90])
	by hub.freebsd.org (Postfix) with ESMTP id 6A9201517E
	for <freebsd-sparc@freebsd.org>; Wed, 26 Jan 2000 00:04:35 -0800 (PST)
	(envelope-from lgriffin@BSD4US.ORG)
Received: from localhost (lgriffin@localhost)
	by bsd4us.org (8.9.3/8.9.3) with ESMTP id CAA26112
	for <freebsd-sparc@freebsd.org>; Wed, 26 Jan 2000 02:59:55 -0500 (EST)
Date: Wed, 26 Jan 2000 02:59:31 -0500 (EST)
From: Lyndon Griffin <lgriffin@bsd4us.org>
To: freebsd-sparc@freebsd.org
Subject: Re: SS 470 info
In-Reply-To: <Pine.BSF.4.10.10001252351260.61908-100000@beppo.feral.com>
Message-ID: <Pine.BSO.4.10.10001260258320.32503-100000@ns.bsd4us.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-sparc@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

How does the 470 compare to the 600, in this respect?

<:)  Lyndon Griffin
http://www.bsd4us.org

On Tue, 25 Jan 2000, Matthew Jacob wrote:

> 
> Not significantly different- just more- it's a 3rd level MMU extension to the
> 2 level sun4c/sun4/sun3 stuff. On the older machines it was a resource
> limitation of pte's mapped by PMEG (page map entry group). The sunray MMU
> added SMEG (system map entry group) to map groups of PMEGs.
> 
> If you mean "Is it different from other sparcs", i.e., sun4m/sun4u, yes-
> sun4m/sun4u both have real memory page tables. The older sun machines were
> more like the VAX- restricted amounts of SRAM to provide a multilevel TLB.
> For the time an excellent but cheap design. With respect to flexibility, gawd
> awful.



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-sparc" in the body of the message