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    SubjectRe: Early SPECWeb99 results on 2.5.33 with TSO on e1000


    On Thu, 5 Sep 2002, Nivedita Singhvi wrote:

    >
    > > value in your results is in saving on retransmits; I would think
    > > shoving the data down the NIC and avoid the fragmentation shouldnt
    > > give you that much significant CPU savings. Do you have any stats
    >
    > Why do say that? Wouldnt the fact that youre now reducing the
    > number of calls down the stack by a significant number provide
    > a significant saving?

    I am not sure; if he gets a busy system in a congested network, i can
    see the offloading savings i.e i am not sure if the amortization of the
    calls away from the CPU is sufficient enough savings if it doesnt
    involve a lot of retransmits. I am also wondering how smart this NIC
    in doing the retransmits; example i have doubts if this idea is briliant
    to begin with; does it handle SACKs for example? What about
    the du-jour algorithm, would you have to upgrade the NIC or can it be
    taught some new trickes etc etc.
    [also i can see why it makes sense to use this feature only with sendfile;
    its pretty much useless for interactive apps]

    Troy, i am not interested in the nestat -s data rather the TCP stats
    this NIC has exposed. Unless those somehow show up magically in netstat.

    cheers,
    jamal

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