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
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