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    SubjectRe: Early SPECWeb99 results on 2.5.33 with TSO on e1000
    "Martin J. Bligh" <> writes:

    > > Ie. the headers that don't need to go across the bus are the critical
    > > resource saved by TSO.
    > I'm not sure that's entirely true in this case - the Netfinity
    > 8500R is slightly unusual in that it has 3 or 4 PCI buses, and
    > there's 4 - 8 gigabit ethernet cards in this beast spread around
    > different buses (Troy - are we still just using 4? ... and what's
    > the raw bandwidth of data we're pushing? ... it's not huge).
    > I think we're CPU limited (there's no idle time on this machine),
    > which is odd for an 8 CPU 900MHz P3 Xeon,

    Quite possibly. The P3 has roughly an 800MB/s FSB bandwidth, that must
    be used for both I/O and memory accesses. So just driving a gige card at
    wire speed takes a considerable portion of the cpus capacity.

    On analyzing this kind of thing I usually find it quite helpful to
    compute what the hardware can theoretically to get a feel where the
    bottlenecks should be.

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