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    SubjectRe: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28
    Eric Dumazet a écrit :
    > Christoph Lameter a écrit :
    >> AIM9 results:
    >> TCP UDP
    >> 2.6.22 104868.00 489970.03
    >> 2.6.28-rc5 110007.00 518640.00
    >> net-next 108207.00 514790.00
    >>
    >> net-next looses here for some reason against 2.6.28-rc5. But the numbers
    >> are better than 2.6.22 in any case.
    >>
    >
    > I found that on current net-next, running oprofile in background can
    > give better bench
    > results. Thats really curious... no ?
    >
    >
    > So the single loop on close(socket()), on all my 8 cpus is almost 10%
    > faster if oprofile
    > is running... (20 secs instead of 23 secs)
    >

    Oh well, thats normal, since when a cpu is interrupted by a NMI, and
    distracted by oprofile code, it doesnt fight with other cpus on dcache_lock
    and other contended cache lines...


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