HZ vs battery life

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I measured idle battery life at 250HZ, which is what my SL10.1-beta8
laptop has as the default.

I compiled the distro kernel with HZ=1000 and battery life got worse --
no surpose.

But then I built with HZ=100 and it was the same results as HZ=1000,
when I expected it to be better than HZ=250.

clues?
-Len

ps. yes, I'm running at init5.  I'll repeat at init1.
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