Here''s a peculiar one. I''m trying to simulate some speed
effects due to
varying sized packets so I have written a quick perl app which spits out
packets of a fixed size (<1500 bytes). What I''m finding is the
despite
apparently turning off nagle and everything else I can think of I still
notice that when the receiver isn''t keeping up that the sending side
(linux 2.6.11) is coalescing the packets and sending fewer large packets...?
Is this a known and expected thing to do, or am I likely suffering some
buffering effects in my perl app?
Note: I am observing the effect based on tcpdump traces, so I can
clearly see when it''s sending the expect 1000 byte packets, and when
it''s suddenly packing them altogether into max MTU sized packets. Note
also that it''s *sending* them like this, it''s not just the the
receiver
is buffering and receiving them like this...
Seems odd to me?
Ed W
