Constantinos Makassikis wrote:
As it can be seen, we hardly reach 70 % of the value predicted by the
formula
and apparently it seems that it is due to the fact that MAX SND
remains relatively
low compared to SNDBUF.
This is due to the fact that (differently than BSD) Linux treats socket
buffer sizes as limits on the amount of kernel memory that socket
buffers can consume, rather than the number of in-band TCP data they can
hold. There's a certain amount of overhead involved in storing the
buffered data, so you'll see a correspondingly smaller window size, if
the TCP window is limited by the socket buffer size.
-John
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