Newsgroups: comp.parallel
From: "Dr. Jesus Antonio Sanchez Velazquez" <jsanchez@campus.cem.itesm.mx>
Subject: Re: TCP-IP performance using SMP
Organization: A poorly-installed InterNetNews site
Date: 29 Sep 1995 17:31:26 GMT
Message-ID: <44hahe$627@usenet.srv.cis.pitt.edu>

>> Does anyone out there have information about the impact of using a
>>  SMP machine on TCP-IP performance over a high speed network.  All
>> of the performance data I've found regarding achievable transfer
>> rates over ATM or Fibre Channel has been measured using single
>> processor machines.  In most of the tests the CPU seemed to be the
>> limiting factor.  I'm looking for data that shows what improvement
>> can be achieved if the CPU bottle neck is removed by using multiple
>> CPUs (this assumes the network drivers can use multiple CPU).  A
>> configuration something like the following:

>    -----------------                          ------------------
>    |               |                          |                |
>    |  Process 1 >  |                          |  > Process 3   |
>    |  Process 2 >  |                          |  > Process 4   |
>    |               |--->>--- Network --->>----|                |
>    |  SMP Box 1    |                          |  SMP Box 2     |
>    -----------------                          ------------------>

> Also, any information on the additional gain of adding a second network
> connection would also be useful.

I have an article written in Spanish (i'm sorry !) about this problem.
We've made experiences to measure the communication time between
clients and sequential and parallel servers (MIMD, not SMP). We have
also experienced with parallel implementation of TCP. The gain in time
is significant. You can find this article in:

 http://research.cem.itesm.mx/jesus/articulos/clei2/clei2_ToC.html

I hope it's of some help for you. 

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Jesus Sanchez V.                | 3265614
Centro de Tecnologia en Infor-
  matica                        | jsanchez@campus.cem.itesm.mx
DGI-ITESM-CEM                   |
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