FreeBSD and Linux networking code (what is different?)

From: mamachari <inou0...@gold.tc.umn.edu>
Subject: 64 bit Linux?
Date: 1995/05/19
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Greetings!

I was curious if there is now or will soon
be a 64 bit version of Linux for Pentium-class
machines.

Thank you in advance.

David

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http://www.umn.edu/nlhome/g500/inou0003/
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From: fbenn...@cais.com ()
Subject: Re: 64 bit Linux?
Date: 1995/05/20
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mamachari <inou0...@gold.tc.umn.edu> wrote:

>Greetings!

>I was curious if there is now or will soon
>be a 64 bit version of Linux for Pentium-class
>machines.

>Thank you in advance.

>David

>////////////////////////////////////////
>http://www.umn.edu/nlhome/g500/inou0003/
>////////////////////////////////////////

Do you mean something that will handle the dual processor???? If thats
the fact then yes I am curious when the dual processor version will
come out.

Thanks.

From: niem...@clark.net (David C. Niemi)
Subject: Re: 64 bit Linux?
Date: 1995/05/26
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In article <3pm1i9$...@news.cais.com>, fbenn...@cais.com () writes:
>mamachari <inou0...@gold.tc.umn.edu> wrote:
>>I was curious if there is now or will soon
>>be a 64 bit version of Linux for Pentium-class
>>machines.
>Do you mean something that will handle the dual processor???? If thats
>the fact then yes I am curious when the dual processor version will
>come out.

First, don't yearn so strongly for a true 64-bit processor, as it carries
a lot of baggage (as true 64-bit code for the Alpha should show you).  You
need to distinguish a 64-bit data bus (which the Pentium has) from 64-bit
date and address registers (which neither the Pentium nor the P6 has).

Going blindly to full 64-bit code causes the code to fluff up, potentially
*slowing down* the system unless bandwidth to DRAM is expanded similarly.
One of the biggest performance advantages of Intel processors a very compact
instruction set; while it comes at the price of a ridiculously irregular
decoding scheme.

The current version of Linux already makes very good use of the Pentium.
A few % on a few key benchmarks can be achieved by using a more optimized
version of GCC, but this has not been debugged.

As for dual processors, a multiple processor version of Linux is just starting,
and it will take a long time (at least several months) before it is useable.
OTOH, some very good people are working on it and they have a good plan,
so in a couple of years I expect the problem will be solved.

------------------------------------------------------------------
David C. Niemi (SLMA, Herndon, Virginia, USA)    niem...@clark.net
Know the difference between the color of the wine and the color of
the glass.  (Jalaluddin Rumi)
------------------------------------------------------------------

From: dun...@cl-next4.cl.msu.edu (Steve Dunham)
Subject: Re: 64 bit Linux?
Date: 1995/05/26
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David C. Niemi (niem...@clark.net) wrote:
: As for dual processors, a multiple processor version of Linux is
: just starting, and it will take a long time (at least several
: months) before it is useable.  OTOH, some very good people are
: working on it and they have a good plan, so in a couple of years I
: expect the problem will be solved.

Thomas Radke et al, at TU Chemnitz-Zwickau, have a dual-pentium Linux
kernel that runs on the Compaq ProLiant 4000.  The kernel runs on both
processors, but only runs on one at a time via a locking mechanism
described in their paper.

One of the benchmarks they used in the paper was compiling 135 C++
source files (with make --jobs2) so it works enough to get the
compiler running (the user time was cut in half and the system time
was about the same).

They've also implemented a multithreading Linux kernel, described in
another paper.

In <Pine.LNX.3.91.950509234546.893A-100...@goliath.csn.tu-chemnitz.de>
Ronald Wahl <r...@informatik.tu-chemnitz.de> gives the URL:

  http://www.tu-chemnitz.de/~jwern/parlabs.html

for these papers and also said he would email them.  They are in
GERMAN. You may have problems getting them to print on American
printers; I had to go into the .ps code and change the paper type from
`a4' to `letter' to get it to print right.

(The papers are numbered 02/95 for the multiprocesor one and 06/94 for
the threads one.)

Steve
dun...@gdl.msu.edu

From: iia...@iifeak.swan.ac.uk (Alan Cox)
Subject: Re: 64 bit Linux?
Date: 1995/05/26
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In article <3q4mcu$...@msunews.cl.msu.edu> dun...@cl-next4.cl.msu.edu (Steve Dunham) writes:
>David C. Niemi (niem...@clark.net) wrote:
>: As for dual processors, a multiple processor version of Linux is
>: just starting, and it will take a long time (at least several
>: months) before it is useable.  OTOH, some very good people are
>: working on it and they have a good plan, so in a couple of years I
>: expect the problem will be solved.
>
>Thomas Radke et al, at TU Chemnitz-Zwickau, have a dual-pentium Linux
>kernel that runs on the Compaq ProLiant 4000.  The kernel runs on both
>processors, but only runs on one at a time via a locking mechanism
>described in their paper.

Unfortunately they are using code which is compaq NDA covered so its not
of major use to anyone 8(. The papers are worth decoding from German though.

Alan