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Linux 2.4 and later versions implemented a sender-side autotuning mechanism, so that setting the optimal buffer size on the sender is not needed (see here). This assumes you have set large buffers on the receive side, as the sending buffer will not grow beyond the size of the receive buffer.

Wiki MarkupThere is an interesting \ [discussion on the effects of buffering on [RTTs|http://gettys.wordpress.com/2010/12/03/introducing-the-criminal-mastermind-bufferbloat/].

The poor reachability of UETTAXILA makes the problem harder to diagnose.

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