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    SubjectRe: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC
    Erik Bosman wrote:
    >
    > It took me a while, but I have done some tests om my system with and
    > without my patch applied.
    >
    > All deamons but klogd/syslogd were shut down andI used the following
    > command:
    >
    > LMBENCH_SCHED="SINGLE" \
    > /usr/lib/lmbench/bin/{i686-pc,x86_64}-linux-gnu/lat_ctx -s 0 2
    >
    > The variation was quite high so I ran it a 1000 times for each
    > configuration.
    >
    > x86_32, patch applied, 1000x repeated, avg: 1.319, rmse: 0.081
    > x86_32, patch not applied, 1000x repeated, avg: 1.335, rmse: 0.107
    >
    > x86_64, patch applied, 1000x repeated, avg: 1.417, rmse: 0.0716
    > x86_64, patch not applied, 1000x repeated, avg: 1.423, rmse: 0.0745
    >
    > This is on a core 2 duo E6300.
    >

    OK, so it sounds like there is no measurable difference. Good.

    -hpa


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