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    SubjectRe: [PATCH] Dynamic tick for x86 version 050610-1
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    On Tue, 2005-07-19 at 14:51 +0800, hugang@soulinfo.com wrote:
    > On Sat, Jun 18, 2005 at 04:30:32PM +1000, Benjamin Herrenschmidt wrote:
    > >
    > > > I'm try to port it powerpc, Here is a patch.
    > > >
    > > > Port Dynamic Tick Timer to new platform is easy. :)
    > > > 1) Find the reprogram timer interface.
    > > > 2) do a hook in the idle function.
    > > >
    > > > That worked on my PowerBookG4 12'.
    > >
    > > Did you get a measurable gain on power consumption ?
    > >
    > > Last time I toyed with this, I didn't.
    >
    > Today I do a measurable about it.
    >
    > First I using 2.6.12 without dynamic enable and unplug the AC power,
    > I check the /proc/pmu/battery_0, like this.
    > --
    > flags : 00000011
    > charge : 907
    > max_charge : 2863
    > current : -987
    > voltage : 10950
    > time rem. : 3600
    > --
    > I only intresting with current, that show the system power load.
    >
    > When I enable dynamic, The current can low at -900.

    The numbers are repeatable ? I mean, if you actually let it settle down
    in both cases ? Also, you should be careful about "parasites" in the
    measurement, like pbbuttons dimming the backlight, the hard disk going
    to sleep etc...

    >From your numbers you get something like 10% improvement, which isn't
    too bad.

    Ben.


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