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    SubjectRe: Scheduler regression: Too frequent timer interrupts(?)

    * Christoph Lameter <> wrote:

    > On Fri, 17 Apr 2009, Peter Zijlstra wrote:
    > > And a random 1us cutoff, is well, random.
    > Its got to be somewhere.

    Sorry, that's not a rational answer that makes any sense.

    Peter's point is statistics 101: please show absolute values not an
    event distribution cutoff - how much total time do we spend in the
    kernel in that workload?

    Is the overhead 1%? 2%? 0.5%? And how did it change from 2.6.22
    onwards? Did it go up by 0.1%, from 1% to 1.1%? Or did the average
    go down by 0.05%, while increasing the spread of events (thus
    fooling your cutoff)?

    These are very simple, very basic, very straightforward questions -
    and no straight answer was forthcoming from you. Are you not
    interested in that answer?


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