poor throughput question

Craig Partridge craigp at world.std.com
Sat Jan 8 14:09:57 UTC 2000


It seems to me that you have two distinct concerns:

* Your modem connect speed is not what you'd like.  That depends very
  much on the particular conditions of the telephone lines between you
  and Megapop (testing via another ISP does not demonstrate the state
  of the lines, unless that ISP is colocates its equipment with Megapop).

  The symptoms you describe are consistent with poor line quality (possibly
  due to backhauling of lines)

* Your TCP transfer speeds from whatever site your are measuring from are
  not what you'd like.

  TCP transfer speeds depend on a variety of factors (distance to the
  remote site, congestion, etc).  Traceroute is telling you how long
  the paths are (are they similarly long via the other ISP)?  Tracking
  loss is somewhat harder but you can look at your TCP retransmission and
  duplicate ack transmission rates at your host to get a sense (these numbers
  should be very very low, except when loss occurs).

  Others here may have better analysis tools.

Good luck!

Craig



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