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    SubjectRe: Linux and Network Flight Recorder

    We have NFR working using Alexei's ring buffer code in conjunction with
    the Linux kernel packet filtering.

    It's not a BPF API, but it semes to work just fine.

    On Tue, 22 Jun 1999, Rogan Dawes wrote:

    > The following message was mailed to the Network Flight Recorder Users
    > mailing list as part of a debate on the performance of the Linux packet
    > filtering implementation.

    > ______________________________ Forward Header __________________________________
    > Subject: Re: Redhat 6.0
    > Author: "Marcus J. Ranum" <mjr@nfr.net> at Internet-SA
    > Date: 99/06/21 11:21 PM
    >
    >
    > >I think NFR might want to take a good look
    > >at what can be done with Linux.
    >
    > We have had Zero customers make Linux a requirement for
    > purchase. Obviously someone could change that, by writing
    > "I need Linux" on the back of a Purchase Order for, say,
    > 200 units, and Linux will get our undivided attention. ;)
    >
    > Joking aside, we _have_ done a lot with Linux. For each
    > version, when it's come out, we've tested its performance
    > and found it inadequate. We've explained, in this forum
    > and in others, gently and less gently, why Linux' packet
    > capture code is mediocre. We've burned considerable man
    > hours attempting to transfer clue to Linux religionists,
    > and now, I see, to ""technology" journalist" Linux
    > religionists. The main answer we get is "if you don't like
    > Linux's packet capture, then _FIX_ it."
    >
    > We don't like it.
    >
    > Why don't _YOU_ fix it?
    >
    > C'mon, seriously - one of you Linux heads out there
    > could write the bitchenest zero-copy packet capture
    > code on the planet. We'll buy you a beer. Hell, we'll
    > buy you a case. How about it? We're busy writing studly
    > traffic analysis engines. We're busy making them work
    > at speeds close to 100mb/s on reasonable hardware running
    > reasonable operating systems. We're _BUSY_, get it? Fixing
    > Linux is not our job, making the best ID software on the
    > market is our job.
    >
    > Tell you what, smarty-pants. I'll give you $4,000 and a
    > cool NFR T-shirt if you write a zero copy-per-packet
    > input bpf emulation for Linux. Ok? I'll do one better than
    > you can do: I'll put my money where my mouth is.

    =====================================================================
    Mike Fisk | (505)667-5119 | MS B255
    Network Engineering (CIC-5) | | Los Alamos National Lab
    mfisk@lanl.gov | FAX: 665-7793 | Los Alamos, NM 87545


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