RE: FTP Conundrum with Communication Trace

["Murphy, Guy" <murphy@xxxxxxxxxxxxxxxxx>]

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        IBM got back to me on the cause of the problem.  The answer they
gave me worked. I'll quote IBM here:

        "The key to this problem is with the configuration of the 2838 line
description vs the ETH Switch box.
         - Tom will email Guy a KB doc  6654625 that will explain and bottom
line is that the ETH line description
                LINESPEED should  = *AUTO

              DUPLEX    should  = *AUTO


        These will allow the 2838 card to sync up with the switch it is
attach to (assuming the switch is set to negotiate. Since there are
currently collisions on the ETH running the commtrace slows the line down
just enuf to prevent the collisions and thereby allowing throughput to be
faster with the commtrace running."

        If you or anyone wants a copy of document 6645625, it's at

http://www-912.ibm.com/s_dir/slkbase.nsf/1ac66549a21402188625680b0002037e/99
0a2cc52f1fb76186256665004727bf?OpenDocument&Highlight=0,6654625

        or I can email it to you.  The document covers more that the 2838
Ethernet adapter which we use.

Guy Murphy
murphyfa@uiuc.edu
UDIS at the University of Illinois
217-333-8670
http://www.heisercoaching.com


-----Original Message-----
From: chris.whisonant@comporium.com
[mailto:chris.whisonant@comporium.com]
Sent: Thursday, October 04, 2001 10:21 AM
To: midrange-l@midrange.com
Cc: StanWilburn@comporium.com; Johnny.Helms@comporium.com;
gwbowers@bellsouth.net
Subject: Re: FTP Conundrum with Communication Trace



I just tested this and here are my results:

With no trace on a development machine (model 270, v5r1), I put a file from
my pc at 544.69Kbytes/sec.
I started a trace and put the file at 2863.66Kbytes/sec.
I stopped and deleted the trace and put the file at 680.74Kbytes/sec.

On our production machine (model 720, v4r4), I first put file with no trace
at 389.10Kbytes/sec.
After starting the trace, I put the file at 1330.83Kbytes/sec.
After ending and deleting the trace, the figure went to 437.43Kbytes/sec.

Seems like this is not just v5r1.

Thanks,
Chris Whisonant

"I started a comm trace on the V5R1 machine to see if I
could see anything in the trace that would account for the slow speed.  As
soon as I started the trace, the transfer rates went to 1400-1800
Kbytes/sec.  When I stop and delete the trace, the rates go back to 55-65
Kbytes/sec.
           This morning I decide to test a PC to V5R1 file transfer.  The
PC is
not on the same switch.  Without an active comm trace, the speed was 310
Kbytes/sec.  With an active trace, the rate was 730 Kbytes/sec.
           This is so bizarre.  It seems as though V5R1 ftp needs an
audience
to perform better.  Is this happening to anyone else?

Guy Murphy"

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