Date: Tue, 25 Jan 2000 23:56:31 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Lyndon Griffin <lgriffin@bsd4us.org> Cc: freebsd-sparc@FreeBSD.ORG Subject: Re: SS 470 info Message-ID: <Pine.BSF.4.10.10001252351260.61908-100000@beppo.feral.com> In-Reply-To: <Pine.BSO.4.10.10001260057040.26587-100000@ns.bsd4us.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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. On Wed, 26 Jan 2000, Lyndon Griffin wrote: > Does anyone have MMU info on the SPARCserver 470? My understanding is > that it's significantly different than the other sun4's. > > <:) Lyndon Griffin > http://www.bsd4us.org > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-sparc" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-sparc" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.10.10001252351260.61908-100000>