Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site oberon.UUCP Path: utzoo!linus!philabs!prls!amdimage!amdcad!decwrl!decvax!tektronix!hplabs!sdcrdcf!oberon!blarson From: blarson@oberon.UUCP (Bob Larson) Newsgroups: net.arch Subject: Re: Cache revisited Message-ID: <100@oberon.UUCP> Date: Wed, 14-Aug-85 12:12:27 EDT Article-I.D.: oberon.100 Posted: Wed Aug 14 12:12:27 1985 Date-Received: Tue, 20-Aug-85 01:47:29 EDT References: <5374@fortune.UUCP> <901@loral.UUCP> <2583@sun.uucp> <5459@fortune.UUCP> Reply-To: blarson@Usc-Ecl.Arpa (Bob Larson) Distribution: net Organization: U. of So. Calif., Los Angeles Lines: 17 Keywords: Cashe Summary: Salespeople exagerate In article <5459@fortune.UUCP> wall@fortune.UUCP (Jim wall) writes: > The numbers that are claimed for the hit rates on caches are >nothing short of incredible. I think the CPU manufacturers are the >instigators, and nobody bothers to question them. > I know of one computer manufacturer that has one set of numbers for cashe hit rate given out by the salespeople and another by the technical people. (95% vs 98%) The manuals list the higher figure. They also just got around to revising all the manuals to say that a word is 32 bits rather than 16. Since the basic addressing unit of the machine is 16 bits, this makes talking about the machine akward. (The basic addressing unit of a VAX is 8 bits.) Bob Larson Arpa: Blarson@Usc-Ecl.Arpa Uucp: {ihnp4,hplabs,...}!sdcrdcf!uscvax!oberon!blarson