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    SubjectRe: hackbench regression due to commit 9dfc6e68bfe6e
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    Le jeudi 08 avril 2010 à 00:05 -0700, David Miller a écrit :
    > From: Eric Dumazet <eric.dumazet@gmail.com>
    > 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...

    Thanks !

    But hackbench is a af_unix benchmark, so loopback stuff is not used that
    much :)


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