🚀 go-pugleaf

>> >From iso-RELAY@SRI-NIC.ARPA  Sat Jul  1 01:33:16 1989
>> Date: 29 Jun 89 15:40:03 GMT
>> From: intercon!amanda%intercon.uu.net@uunet.uu.net  (Amanda Walker)
>> Subject: Re: Null Protocol Layers Question
>> References: <36800002@m.cs.uiuc.edu>
>> Sender: iso-relay@sri-nic.arpa
>> To: iso@sri-nic.arpa
>> 
>> In article <36800002@m.cs.uiuc.edu>, zweig@m.cs.uiuc.edu writes:
>> > [...]
>> > Furthermore, this nonsense about "having to do the encoding at runtime" is
>> > laughable.
>> > [...]
>> > -Johnny The-OSI-Reference-Model-has-nothing-to-do-with-Implementation
>> > (#include <stddisclaimer.h>)
>> 
>> I agree completely.  ASN.1/BER are *representations*, not algorithms.  Once
>> "the bits are on the wire," so to speak, how they got there is immaterial,
>> as is what the receiving process does with them.
>>
	.
	.
	.
>> --
>> Amanda Walker
>> InterCon Systems Corporation
>> --
>> amanda@intercon.uu.net  |  ...!uunet!intercon!amanda


This is like saying that Theory has nothing to do with Application.  While
in many cases it is certainly true that a Model has nothing to do with
Implementation it is not always the case.  If the goal is to build a
model that maps to many different instantiations then a completely
independent model is desireable.  In that case it is indeed true
that the model doesn't have that much to do with an implementation.

So XDR or ASN.1 are representations.  Big deal.  Given any representation
there are many implementations some better than others.  Given a
particular machine and a particular representation there is at least
one optimal implementation.  Optimal when performance is considered.
Performance is a big deal that's what's driving all of this conversation.
Given different representations and their mappings to a given machine
will directly impact the implementation and the resultant performance.

In other words, the Model and the Representation directly impact the
implementation and the resultant performance.

-c
cire|eric

Eric B. Decker
Token Ring Development
cisco Systems - engineering
Menlo Park, California

email:	cire@cisco.com
uSnail: 1360 Willow Rd.,  Menlo Park, CA  94025
Phone : (415) 326-1941

I speak for myself here.