Presumably on a sufficiently large SMP machine that this became an
issue, there would be multiple NICs. Maybe it would make sense to
have one udp socket for each NIC. Would that make sense? or work?
It feels to me to be cleaner than one for each CPU.
Doesn't make much sense.
Usually we are talking via one IP address, and thus over
one device. It could be using multiple NICs via BONDING,
but that would be transparent to anything at the socket
level.
Really, I think there is real value to making the socket
per-cpu even on a 2 or 4 way system.
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