[TEST/REVIEW] CPU accounting patches
gurney_j at resnet.uoregon.edu
Fri Jan 27 01:13:08 PST 2006
Brian Candler wrote this message on Fri, Jan 27, 2006 at 08:56 +0000:
> I think what you're saying is: I'm at no risk of my CPU becoming maxed out
> when speed has been automatically reduced by a power-saving daemon, because
> it will only stay there if there is still some spare capacity (i.e. some
> time is regularly spent in the HLT state). If not, the daemon will keep
> cranking up the clock speed until there *is* some spare capacity, or until
> max clock speed is reached.
> I guess this is OK, *if* you trust the power management system to do its job
> properly. Unfortunately I have very bad experiences of such things. In many
> cases I've ended up turning off power management completely and locking
> everything at max clock speed. Mind you, if I do that, anything you do with
> scaling factors isn't going to affect me, so actually I don't really care.
> I'll shut up now :-)
The powerd utility monitors the system state and sets various power con-
trol options accordingly. It offers three modes (maximum, minimum, and
adaptive) that can be individually selected while on AC power or batter-
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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