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Cell Relay Retreat>List Archive>month:1998-Jun> msg00074



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Re: Cable ISP RILES ME!! WHAT TOOLS TO TEST PERFORMANCE

  • From: rfm@world.std.com (Robert F Mabee)
  • Date: Tue, 16 Jun 1998 16:41:58 GMT

Is your freeze associated with evil old ^S flow control, or with high-volume
screen fills to a real terminal?  I have had complex lashups of rlogin and
telnet freeze at the point where I used ^S to stop scrolling and suspect
that the flow control is not consistently handled, ie when applications
change TTY modes, leaving one terminal emulator absorbing my ^Q before it
can reach another emulator that's holding the ^S.

I do not think the ping flood drops tell you anything except that there is
a hop on which you can't get as much bandwidth as on the dedicated Enet.

You say the problem is intermittent, so maybe you can open another session
to the same host and see what is the status of the first connection and
associated processes.  netstat can show whether telnet input is reaching the
host and whether output is leaving or accumulating.