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    SubjectRe: hackbench regression due to commit 9dfc6e68bfe6e
    From: Eric Dumazet <>
    Date: Thu, 08 Apr 2010 09:00:19 +0200

    > If run individually, the tests results are more what we would expect
    > (slow), but if machine runs the two set of process concurrently, each
    > group runs much faster...

    BTW, I just discovered (thanks to the function graph tracer, woo hoo!)
    that loopback TCP packets get fully checksum validated on receive.

    I'm trying to figure out why skb->ip_summed ends up being
    CHECKSUM_NONE in tcp_v4_rcv() even though it gets set to
    CHECKSUM_PARTIAL in tcp_sendmsg().

    I wonder how much this accounts for some of the hackbench
    oddities... and other regressions in loopback tests we've seen.

    Just FYI...

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      Last update: 2010-04-08 09:09    [W:0.019 / U:151.696 seconds]
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