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From: chris@umcp-cs.UUCP (Chris Torek)
Newsgroups: net.unix-wizards
Subject: Re: MBUF problems
Message-ID: <3273@umcp-cs.UUCP>
Date: Wed, 19-Feb-86 10:33:47 EST
Article-I.D.: umcp-cs.3273
Posted: Wed Feb 19 10:33:47 1986
Date-Received: Fri, 21-Feb-86 06:00:54 EST
References: <994@brl-smoke.ARPA>
Organization: U of Maryland, Computer Science Dept., College Park, MD
Lines: 28

In article <994@brl-smoke.ARPA> cck%cucca.columbia.arpa@BRL.ARPA

... describes a problem with the Ultrix 1.1 DEQNA (MicroVAX) driver,
and suggests possible fixes.

>1.  Fix dtom.

dtom() is not broken: it is the DEQNA driver that is broken.  Fix
that.

>2. Drop usage of dtom where necessary.

Again, this is the wrong fix.

>3. Drop usage of the private page pool.

The DEQNA driver should not use private mclusters.  It should use
the standard ones, in the standard ways; see vaxif/if_uba.c.  (The
4.3 version handles multiple transmit and receive buffers.  I would
guess that this is part of the problem in the Ultrix driver.)
There are no problems with dtom() as long as the drivers adhere to
the protocol requirements.

I suspect the Ultrix 1.2 DEQNA driver is already fixed.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 1415)
UUCP:	seismo!umcp-cs!chris
CSNet:	chris@umcp-cs		ARPA:	chris@mimsy.umd.edu