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Scheduler: new REUSEPORT balancing method/architecture.
Starting from Linux Kernel 3.9, there is a new TCP/UDP socket option which allows to bind same port and address from multiples threads (or any instance under the same process context). This patch implements the SO_REUSEPORT TCP Flag if the running Kernel is >= 3.9, so on that mode each working thread create it own socket that bind the same address, with this implementation we reduce the number of system calls involved when a new connection arrives, avoid lookup the lowest loaded thread and also we allow the Kernel to perform a better Scheduling on SMP systems that requires to scale. If the detected Kernel is lower than 3.9, it will use the old Fair Balancing mechanism. Signed-off-by: Eduardo Silva <edsiper@gmail.com>
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