select() with timeout==
0 (non-blocking), this
option causes non-accelerated sockets to be polled only every N μsecs.
This reduces latency for accelerated sockets, possibly at the expense of latency on unaccelerated sockets. Because accelerated sockets are typically the parts of the application which are most performance-sensitive this is often a good tradeoff.
Set this option to zero to disable, or to a higher value to further improve latency for accelerated sockets.
This option changes the behavior of
select() calls, so could potentially cause an application to misbehave.