First suggestion: use TCP, and get flow control for free (not free of course,
but it's worth it).
If you really want to (or have to) use UDP and no flow control, in my
experience enlarging the UDP socket buffers works wonders. You could probably
use the parameters you mention to achieve this. But rather than changing the
system-wide defaults, I strongly suggest that you use setsockopt(...,
SOL_SOCKET, SO_{SND,RCV}BUF, ...) on the sending and receiving sockets of your
non-flow-controlled application.
--
Simon.
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