Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!hplabs!hplabsz!renglish
From: renglish@hplabsz.HPL.HP.COM (Bob English)
Newsgroups: comp.arch
Subject: Re: HPE Spectrum
Message-ID: <6067@hplabsz.HPL.HP.COM>
Date: 16 Oct 90 00:06:07 GMT
References: <123093@linus.mitre.org> <6058@hplabsz.HPL.HP.COM>
Reply-To: renglish@hplabsz.UUCP (Bob English)
Organization: Hewlett-Packard Laboratories
Lines: 14

In article <6058@hplabsz.HPL.HP.COM> renglish@hplabsz.UUCP (Bob English) writes:
>The Mach port done at the University of Utah, for example, ran
>about 20% slower than hp-ux because of Mach's penchant for VM aliasing.

Just a clarification here:  Mach is not inherently 20% slower on
PA-RISC, but some changes are necessary to eliminate the 20% performance
penalty.  I chose the example merely to illustrate the difference that
supporting the PA-RISC architecture properly could mean to performance.
The changes needed to the machine-independent portion of the Mach VM
system are minor tweaks, but they make a big difference in performance.

--bob--
renglish@hplabs.hp.com
"A foot in the mouth is worth...wait a minute...!?!?"