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>Gain: no user-kernel process switches; no kernel call to poll completion; no data copying between processes; no interrupt transition

AFAIK that's may be implemented on existing Linux system using Intel DPDK or PF_RING (routing packets directly from NIC to mmap'ed memory in userspace), "maxcpus=" Linux boot directive (to run Linux kernel on one or two cores only), and "pthread_setaffinity_np()" call in user process (to run the process on other cores which will never be imterrupted by Linux kernel).

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