mmap consumes more CPU

[abhinav narain <abhinavnarain10 () gmail com>]

hi,
  I just checked the two mechanism :
(1) Using mmap to fetch packets from kernel to userspace
(2) Using recvfrom() call to fetch packets

I see top reports
(1) 34% memory 20% cpu usage
(2) 21% memory 7% cpu usage !

I wanted a performance improvement using mmap but I am slowing my small
router for packet capture( I can't use pcap for that; I have modified
skbuff ) and its worst than twice !
Memory increase is fine.
Can anyone suggest what going on ? Or how to improve

-Abhinav Narain

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