Roland or Mellanox Engineers:
We setup completion channel for a completion queue. We want to check if
there is any
event available, and suppose there is NO event on both completion channel and
completion queue.
What we can do is:
1. call select() on completion channel with zero timeout and return 0.
2. call ibv_poll_cq() directly and return 0.
Question:
Which way has lower overhead ? We know select() has to switch to
kernel mode, does ibv_poll_cq()
switch to kernel mode and may cause a context switch ?
Thanks.
--CQ Tang_______________________________________________
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