Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!hao!noao!amethyst!arizona!lm
From: lm@arizona.edu (Larry McVoy)
Newsgroups: comp.sys.att
Subject: Re: 3B1: Considering buying, need info
Message-ID: <4329@megaron.arizona.edu>
Date: 14 Mar 88 17:12:43 GMT
References: <10092@stb.UUCP> <192@anumb.UUCP>
Reply-To: lm@megaron.arizona.edu (Larry McVoy)
Organization: University of Arizona, Tucson
Lines: 11

In article <192@anumb.UUCP> eao@anumb.UUCP (e.a.olson) writes:
>>4. VM/paging? Does the MMU require memory to be physically contiguous?
>
>haven't the foggiest. it is some kind of vm though.

The MMU is custom work by Convergent.  It's basically 1024 TLB entries.  As 
I understand it, 4Meg is the max you can put in the box so 1024*4096 == 4Meg
so they have a TLB entry for every page.  Makes lookup pretty easy and they
need no LRU alg to clean out entries since they never have contention.
-- 

Larry McVoy	lm@arizona.edu or ...!{uwvax,sun}!arizona.edu!lm