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    SubjectRe: TCP_STREAM performance regression on commit b3613118
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    On Fri, 2012-02-17 at 13:33 -0500, David Miller wrote:
    > From: Eric Dumazet <eric.dumazet@gmail.com>
    > Date: Fri, 17 Feb 2012 10:50:39 +0100
    >
    > > Le vendredi 17 février 2012 à 16:18 +0800, Alex,Shi a écrit :
    > >> The tcp_stream loop back performance has about 10% drop on the
    > >> commitment on our core2 2 sockets server. This commit has 2
    > >> parents(7505afe28, 5983fe), but both of them have no regression. So
    > >> guess the impact just happened when this 2 parents joint. That beyond
    > >> our capability to dig it more.
    > >>
    > >> Any ideas?
    > >
    > > Most probably the more accurate truesize determination is responsible of
    > > this tcp regression, since some prior assumptions might be wrong.
    > >
    > > Want to give more information on the workload ?
    > > Is it a 32 or 64 bit kernel ?
    >
    > And let's start CC:'ing netdev too.

    Add CC to tang feng, He is working on this issue.

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