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    SubjectRe: is CONFIG_PACKET_MMAP always a win?
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    On Fri, 2002-02-22 at 06:45, Ben Greear wrote:
    >
    >
    > 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.

    Yeah I found it a bit lacking too, I got there in the end though. Check
    out: http://www.scaramanga.co.uk/code-fu/lincap.c

    --
    // Gianni Tedesco <gianni@ecsc.co.uk>
    80% of all email is a figment of procmails imagination.

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