Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.arch
Subject: Re: paging and loading
Message-ID: <7232@utzoo.UUCP>
Date: Wed, 15-Oct-86 16:43:52 EDT
Article-I.D.: utzoo.7232
Posted: Wed Oct 15 16:43:52 1986
Date-Received: Wed, 15-Oct-86 16:43:52 EDT
References: <949@usl.UUCP>, <5100148@ccvaxa>
Organization: U of Toronto Zoology
Lines: 13

> ... The IBM 3090 has already shown an example of a
> system where it is faster to page synchronously rather than context switch,
> in which case your CPU *is* idle while paging - and these are likely to
> become more common. ...

Ah, but what device are they paging from?  If I remember it correctly --
I'm not sure of this -- the 3090 is paging out of ordinary RAM, which they
would have preferred to make directly addressable except that they are
constrained by backward compatibility and not enough address bits.  This
is a kludge, not something that is likely to become widespread.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,decvax,pyramid}!utzoo!henry