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    SubjectRe: is CONFIG_PACKET_MMAP always a win?


    David S. Miller wrote:

    > From: Dan Kegel <dank@kegel.com>
    > Date: Thu, 21 Feb 2002 17:51:20 -0800
    >
    > What's the best way to retrieve raw packets from the kernel?
    >
    > a) use libpcap
    > ...
    > b) use af_packet
    > ...
    > c) enable CONFIG_PACKET_MMAP, use PACKET_RX_RING
    >
    > If I understand it right, b costs one memcpy and one recv, and c costs
    > two memcpys. Which one wins?
    >
    > "a" should be doing "c" when it is available in the kernel.
    > If not, get a newer copy of the libpcap sources, preferably
    > from Alexey's site:
    >
    > ftp.inr.ac.ru:/ip-routing/


    And if you can figure out how to do c, and feel like
    sharing, please do let me know! Documentation is a
    bit sparse..at least wherever I've been looking.

    Enjoy,
    Ben



    --
    Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com>
    President of Candela Technologies Inc http://www.candelatech.com
    ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear


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