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    SubjectRe: want opinions on possible glitch in 2.4 network error reporting
    On Wed, 6 Feb 2002, Ben Greear wrote:

    > >>From the limited testing I just ran, I appears that starfire and 3c59x
    > > handle this correctly, whereas tulip always loses a small number of
    > > packets during a UDP storm. ttcp -us[rt] is very useful for such
    > > testing...
    >
    > It would be interesting to see which side is dropping? Have you
    > coorelated ethernet driver counters to your sendto count?

    It's hard for me to do it right now, because I don't have them in
    isolation (they do NFS and other stuff), and I don't have iptables support
    compiled into the kernel running the tulip. However:

    starfire -> 3c59x
    3c59x -> starfire
    tulip -> 3c59x
    tulip -> starfire

    never lose data on a quiescent network:

    ttcp-t: 83886080 bytes in 7.04 real seconds = 11640.36 KB/sec +++
    ttcp-r: 83886080 bytes in 7.04 real seconds = 11641.10 KB/sec +++

    whereas

    3c59x -> tulip
    starfire -> tulip

    *always* lose several packets:

    ttcp-t: 16777216 bytes in 1.40 real seconds = 11717.40 KB/sec +++
    ttcp-r: 16769024 bytes in 1.40 real seconds = 11679.39 KB/sec +++

    and

    ttcp-t: 33554432 bytes in 2.80 real seconds = 11714.81 KB/sec +++
    ttcp-r: 33456128 bytes in 2.80 real seconds = 11660.28 KB/sec +++

    and

    ttcp-t: 83886080 bytes in 7.00 real seconds = 11704.40 KB/sec +++
    ttcp-r: 83722240 bytes in 7.00 real seconds = 11674.67 KB/sec +++

    So I would tend to blame it on the tulip -- but the Rx side of it, not the
    Tx, which this discussion was about...

    Ion

    --
    It is better to keep your mouth shut and be thought a fool,
    than to open it and remove all doubt.

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