PPP throughput

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#571

From: Paul Black
Date: Thu, 23 Oct 1997 00:00

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I'm having some throughput problems on Linux (Red Hat 4.1).
When I'm connected the throughput will carry on at a nice
hugh rate then drop down to 542 bytes per second.
The following output was obtained this evening on a 31.2
connection with the command "pppstats -i 1":
 11662
 10302
  9253
 10660
 11399
   542
[Several seconds of 542 and 1084 bytes per second snipped]
   542
   542
   965
  4431
 10689
  9649
 10485
 10714

The high throughput is obtained with text data (presumably
lots of compression - seems to be limited by the speed of
the PC modem connection :-).

This throughput problem does not appear with Win 95.
I used to run with kernel 2.0.27 but upgraded to 2.0.30
because some changes were said to fix a TCP stall problem.
More recently, I tried  2.0.31. None of the kernel changes
appeared to have any effect on throughput in any way. The
PPP version is 2.2.0f. Does anyone have any ideas what the
problem is or how I might track it down?

Paul

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From: Paul Black <paul@darwin.demon.co.uk>
Subject: PPP throughput
Date: 1997/10/23
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