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    SubjectRe: Sched - graphic smoothness under load - cfs-v13 sd-0.48
    On 5/19/07, Michael Gerdau <mgd@technosis.de> wrote:
    > > Okay, here's a bonus, http://www.tmr.com/~davidsen/sched_smooth_02.html
    > > not only has the right values, the labels are changed, and I included
    > > more data points from the fc6 recent kernel and the 2.6.21.1 kernel with
    > > the mainline scheduler.
    > >
    > > The nice thing about this test and the IPC test I posted recently is
    > > that they are reasonable stable on the same hardware, so even if someone
    > > argues about what they show, they show the same thing each time and can
    > > therefore be used to compare changes.
    >
    > I'm not sure I follow you here. The difference between 2.6.21 and 2.6.21.1
    > are two simple (as in involving little code) changes to ip4 and ip6 net
    > and I'm not even sure that code is used at all in your tests.
    > [Read: IMO the 2.6.21 and 2.6.21.1 figures are for identical cases].
    >
    > Assuming the above is correct then IMO the variance between the two
    > "dublicated" lines (cfs-v13 and sd048) is such that I would not have
    > written "that they are reasonable stable on the same hardware".
    >
    > I don't want to say the values aren't useful. I simply think there is
    > a high noiselevel.

    The noise is reflected in the standard deviation he has on those rows.
    The average +- stdev of one overlaps the average +- stdev of the
    other, which shows that the test *is* stable, where stable (as always)
    is defined to some accuracy.
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