[fabbione/kronosnet] c24b22: [send/recv] use sendmmsg to reduce latency

GitHub noreply at github.com
Mon Nov 16 07:13:39 CET 2015

  Branch: refs/heads/master
  Home:   https://github.com/fabbione/kronosnet
  Commit: c24b22f5f51d70523a447c418055bea58eb3e265
  Author: Fabio M. Di Nitto <fdinitto at redhat.com>
  Date:   2015-11-16 (Mon, 16 Nov 2015)

  Changed paths:
    M libknet/handle.c
    M libknet/internals.h
    M libknet/threads_send_recv.c

  Log Message:
  [send/recv] use sendmmsg to reduce latency

On my test systems this change reduces the latency from 0.7ms to 0.25ms
when sending 65000 bytes packet and using internal re-assembly code.

Internally use N buffers to split the incoming data and reduce by N frags
the amount of memcpy between kernel and userland.

Signed-off-by: Fabio M. Di Nitto <fdinitto at redhat.com>

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