Path: utzoo!attcan!uunet!wuarchive!brutus.cs.uiuc.edu!apple!bionet!ig!arizona!cjeffery
From: cjeffery@arizona.edu (Clinton Jeffery)
Newsgroups: comp.unix.i386
Subject: Footnote on 16-bit memory, caching, and performance degradation
Keywords: cache
Message-ID: <13490@megaron.arizona.edu>
Date: 25 Aug 89 02:45:22 GMT
Organization: U of Arizona CS Dept, Tucson
Lines: 12


Thanks to all who have posted figures on how much slower their UNIX runs
when 16-bit memory is used.  The figures ranged from 10-40%, despite the
alleged high hit-rates of the cache.  There is a good reason for this
wide variation: the cache technology (write through vs. write back) makes
a big difference.  In addition, programs that manipulate large amounts
of data are going to suffer relative to programs which are code intensive
on machines with write-through caching.
-- 
| Clint Jeffery, U. of Arizona Dept. of Computer Science
| cjeffery@arizona.edu -or- {noao allegra}!arizona!cjeffery
--