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    SubjectRe: TOE brain dump
    Eric W. Biederman wrote:
    > The optimized for low latency cases seem to have a strong
    > market in clusters.

    Clusters have captive, no, _desperate_ customers ;-) And it
    seems that people are just as happy putting MPI as their
    transport on top of all those link-layer technologies.

    > There is one place in low latency communications that I can think
    > of where TCP/IP is not the proper solution. For low latency
    > communication the checksum is at the wrong end of the packet.

    That's one of the few things ATM's AAL5 got right. But in the end,
    I think it doesn't really matter. At 1 Gbps, an MTU-sized packet
    flies by within 13 us. At 10 Gbps, it's only 1.3 us. At that point,
    you may well treat it as an atomic unit.

    > On that score it is worth noting that the next generation of
    > peripheral busses (Hypertransport, PCI Express, etc) are all switched.

    And it's about time for that :-)

    - Werner

    --
    _________________________________________________________________________
    / Werner Almesberger, Buenos Aires, Argentina werner@almesberger.net /
    /_http://www.almesberger.net/____________________________________________/
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