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1994-11-13
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6KB
Date: Wed, 29 Jun 94 04:30:08 PDT
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
Precedence: Bulk
Subject: TCP-Group Digest V94 #133
To: tcp-group-digest
TCP-Group Digest Wed, 29 Jun 94 Volume 94 : Issue 133
Today's Topics:
NOS and the PC (3 msgs)
Router Project
Router Project (TNC from Hell)
Send Replies or notes for publication to: <TCP-Group@UCSD.Edu>.
Subscription requests to <TCP-Group-REQUEST@UCSD.Edu>.
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the TCP-Group Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Tue, 28 Jun 94 09:58:15 EDT
From: crompton@nadc.nadc.navy.mil (D. Crompton)
Subject: NOS and the PC
To: ssampson@sabea-oc.af.mil, tcp-group@UCSD.EDU
DMA vs. Serial I/O?? - Do you mean DMA vs. Polled I/O?? That makes more
sense. In any event it is not clear which is better on the latest fast
PC's. Most Ethernet cards DO NOT use DMA and the IOMEGA drives run FASTER
in polled I/O mode than DMA. Of course this is very dependent on hardware
and software design.
Doug
------------------------------
Date: Tue, 28 Jun 1994 13:01:41 -0500 (CDT)
From: ssampson@sabea-oc.af.mil (Steve Sampson)
Subject: NOS and the PC
To: crompton@NADC.NAVY.MIL (D. Crompton)
>
> Most Ethernet cards DO NOT use DMA . . .
That's true. The NE2000 compatible cards just use serial I/O, but
do bulk transfers if using the Crynwr drivers. The latest cards
(I purchased two Accton cards during their $70 deal) do have a DMA
mode (or shared memory as they call it). Which brings up a couple
of points. The first is that Linux probably does NE2000 mode, and
that some standards must exist on something called an IP-TNC.
That is, that the IRQ and Addresses of I/O devices should be
standardized so only one kernel is needed.
--
Steve
------------------------------
Date: Tue, 28 Jun 94 16:58:07 EDT
From: crompton@nadc.nadc.navy.mil (D. Crompton)
Subject: NOS and the PC
To: crompton@nadc.nadc.navy.mil, ssampson@sabea-oc.af.mil
Steve,
You keep using the term "serial I/O" - actually it is parallel I/O
8 or 16 bits from the ethernet card to the processor buss. The term
Polled I/O vs DMA can be applied to this connected Parallel I/O port.
In other words how is the data retrieved - direct to memory or handled
by the processor in a polled fashion.
Not being an expert I can only relate what I have heard and that is
that DMA, although it sounds great does not always give the results
you would expect. Many of the cards perform better, on fast processors,
in polled mode.
Doug
------------------------------
Date: Tue, 28 Jun 1994 07:20:31 -0400
From: "Brandon S. Allbery" <bsa@kf8nh.wariat.org>
Subject: Router Project
To: tcp-group@ucsd.edu
In your message of Tue, 28 Jun 1994 02:59:02 EDT, you write:
+---------------
| >Ron, I don't understand this. If you're running at 38400, then the BEST you
| >could do is 3,840 bytes/second.
|
| I always thought the thruput in NOS was measured in bytes/sec too.
| I just did an ftp from Linux to the JNOS/Linux and this is what I got:
+------------->8
The speed isn't used on ptys --- why should it? The kernel would have to
introduce artificial delays into what is essentially a memory-to-memory copy.
Ptys go at full bore; you're essentially measuring Linux's context switch and
kernel-to-user-space copy time.
++Brandon
--
Brandon S. Allbery kf8nh@kf8nh.ampr.org bsa@kf8nh.wariat.org
Friends don't let friends load Windows NT. Linux iBCS2 emulation
------------------------------
Date: Tue, 28 Jun 1994 16:34:56 -0400 (EDT)
From: DJ Gregor <dgregor@bronze.coil.com>
Subject: Router Project (TNC from Hell)
To: agodwin@acorn.co.uk (Adrian Godwin)
Adrian Godwin said:
>
> > From: ssampson@sabea-oc.af.mil (Steve Sampson)
> >
> > Develop code for an MS-DOS computer using Borland C++ which
> > has the following components:
>
> But encapsulate the OS dependencies with a view to removing the OS
> altogether : on a system that has no applications, what does DOS
> do to justify it's memory usage after it's loaded NOS ?
> Freedom from DOS would give freedom to use the hardware as a real
> embedded system - cross-compiled, protected mode.
I have been thinking of something like this. If everyone could get together
and write a good amateur radio BBS program for Linux -- **NOT** a JNOS port or
something like that, one that operates like a UNIX shell -- we could then strip
down the Linux kernel, and integrate everything. Make it easy to configure
and use--for the *AVERAGE* BBS operator, like the ones that run MSYS now. If
we do that, we would have a NICE and POWERFULL BBS that would run on a 386 with
4 megabytes of memory. Most of the MSYS operators that I have seen have that
kind of system already.
This already exists, kind of. It is the N0ARY BBS. It was written by Bob
Arasmith, and is meant to run on a Sun workstation. There are a few people
trying to port it over to Linux right now, and I am one of them. Anyone else
want to help???
-----
DJ Gregor, N8QLB
dgregor@bronze.coil.com
"...oh, you use DOS, sorry to hear that..."
------------------------------
End of TCP-Group Digest V94 #133
******************************