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Re: Sprint Help
- From: Leo Bicknell
- Date: Thu Mar 18 14:23:25 2004
In a message written on Thu, Mar 18, 2004 at 11:08:21AM -0800, Michel Py wrote:
> > Leo Bicknell wrote
> > Your problem is right here:
> > 14 urish-pitts-gw.centrepc.net (188.8.131.52) 100 msec *
> > 100 msec NT in many configs defaults to a TCP Window size
> > of 8k, other NT and Server 2000 default to 16k.
> This seems premature as a conclusion to me. If they don't have issues
> with Japan where the best RTT they can get is around 130ms I don't see
> why 100ms would be an issue.
Because these are theoretical maximums. Very minor other issues
(eg some packet reordering, 5-10ms of jitter, a single lost packet
every now and then) will easily cut this in half. 130ms link at
95% of max (about the best you do on a clean link) would be 59k/sec,
a 100ms link with 10ms jitter would drop to around 50% of max, or
40k/sec, or 33% slower.
I bet setting the windows to 32k on both sides fixes his problem.
Leo Bicknell - email@example.com - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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