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From: jg@max.crl.dec.com (Jim Gettys)
Newsgroups: comp.os.mach
Subject: Re: Mach performance? [Long]
Message-ID: <1482@crltrx.crl.dec.com>
Date: 20 Dec 89 22:55:57 GMT
References: <7372@pt.cs.cmu.edu> <14246@jumbo.dec.com>
Sender: news@crltrx.crl.dec.com
Reply-To: jg@max.crl.dec.com (Jim Gettys)
Organization: DEC Cambridge Research Lab
Lines: 13

I don't understand why your off-machine RCP performance is so poor; you
do decently
with on machine RPC (relative to other RPC implementations like that at
DECSRC), 
but your off machine (over the net) case is only comparable to what a
MicroVAX running
Topaz can do, or just running over TCP (X round trip times on Ultrix
over the net using TCP
are less than a factor of two worse (around 3.6 ms)).  Where is the
bottle-neck?
			- Jim Gettys
			  Digital Equipment Corporation
			  Cambridge Research Laboratory