[ale] TCP/PPP Blockage question

John M. Mills jmills at siberia.gtri.gatech.edu
Sat Mar 30 22:29:23 EST 1996


Hello --
I've just installed pppd-2.1.2d and diald, and both seem to work.  I
have moved on to bigger and better problems.

When I use PPP to run Netcape, or try a large network dump, I find my
link coming to a halt.  Repeatedly running `cat /proc/net/dev' shows
an escalating number of "COLL", which I take to mean "collsions."
It also takes quite a long while to get a packet out under these conditions,
an it frequently adds only to the "COLL" count.

Assuming the tcp package was increasing its backoff time  progressively,
I find there is a phrase around line 3456, routhly, in tcp.c, which
suggests the backoff is increasedd with each collision.  I tried a couple
of patches there, with no effect, but I didn't really dope out how
tcp.c works. For all I know, it might not be coming from tcp.c at all --
that was my guess after running 'grep backoff' on the source directories.

My system is 1.2.13  (a.out build), pppd-2.1.2d, and diald for demand-
dialing.

If anyone could make a suggestion, that would be great.

John M. Mills, Senior Research Engineer   --   john.m.mills at gtri.gatech.edu
   Georgia Tech Research Institute, Georgia Tech, Atlanta, GA 30332-0853
        Phone contacts: 770.528.3258 (voice), 770.528.7083 (FAX)
          "Lies, damned lies, statistics, and simulations."






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