Date: Mon, 3 Dec 2001 12:10:27 -0500 (EST) From: Liangping Ma <lma@mail.eecis.udel.edu> Subject: Re: Why so many zeros? Message-ID: <Pine.GSO.4.33.0112031153140.12169-100000@wiggum.ece.udel.edu>
Thanks, Mark!
But the data was about a long FTP from Beijing Univeristy in China to
the University of Delaware in US. Suppose the distance is 12,000km, there
are 10 hops with capacity of 1Gb/s, the MTU is 1500 bytes. The two-way
delay should be more than 0.4 ms, which does not count the processing
delay and queuing delay. If we are lucky, we can have zero queuing delay.
But there are must be some nonzero value for processing delay. If the RTT
is rounded, then the processing delay is under 0.1ms. I don't know the
typical value for the processing delay. I am worry that the RTT is very
easily to exceede 0.5 ms.
Also I observe some RTTs as small as 1, 2 ms. The average of all the
RTTs is around 20ms. The maximum is virtually unbounded.
For delayed ACKs, how are the delays calculated for *each* packet?
Thanks in advance!
Liangping
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