af_packet: recvfrom causing high processor load in system

From: Alexander Riesen (ariesen@traian.de)
Date: Fri Oct 13 2000 - 12:04:33 EDT

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    Hi, dear community,

    The problem: under heavy network load
    (2000 frame/sec and more, traffic produced with Fluke)
    reading from the packet socket (SOCK_PACKET)
    fully loads the processor every ~30 sec (PII-650).
    The higher is the traffic level, the longer is the
    "heavy system load" interval.
    I have tried two NICs (3COM with 3c90x and Kingstone with tulip),
    in promiscuous and normal mode - with the same effect.

    Any help and/or information about this/such problem
    is greatly appreciated.

    Does it cause dropping of packets ?
    Is there a way to workaround the processor load ?

    Cheers,
    Alexander Riesen

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