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    SubjectRe: Power consumption HZ100, HZ250, HZ1000: new numbers
    James Bruce wrote:

    >Theodore Ts'o wrote:
    > > On Mon, Aug 01, 2005 at 12:18:18PM -0400, James Bruce wrote:
    > >>The tradeoff is a realistic 4.4% power savings vs a 300% increase in
    > >>the minimum sleep period. A user will see zero power savings if they
    > >>have a USB mouse (probably 99% of desktops). On top of that, we can
    > ^^^^^^^^
    >
    > > Most laptops (including mine, a Thinkpad T40) use a PS/2 mouse. So in
    > > the places where power consumption savins matters most, it's usually
    > > quite possible to function without needing any USB devices. The 90%
    > > figure isn't at all right; in fact, it may be that over 90% of the
    > > laptops still use PS/2 mice and keyboards.
    >
    >Yes, laptops are mostly PS/2, which is why I only claimed a statistic
    >for desktops. Desktops pretty much all use USB mice now. If 250Hz were
    >only being sold as an option for laptops, we could leave it at that, yet
    >its being pushed as a default that's "good for everyone". For desktops
    >this is not currently true at all. By the time USB is fixed to do power
    >saving, we'll probably have a working tick-skipping patch which makes
    >the whole HZ argument moot.
    >
    > - Jim Bruce
    >
    >
    >
    Maybe new desktop systems - but what about the tens of millions of old
    systems that don't.

    Steve
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