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 ; 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 ; Wed, 26 Jan 2000 02:59:55 -0500 (EST) Date: Wed, 26 Jan 2000 02:59:31 -0500 (EST) From: Lyndon Griffin To: freebsd-sparc@freebsd.org Subject: Re: SS 470 info In-Reply-To: Message-ID: 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