There is no direct relationship between wakeups and watts. Because some programs may cause your CPU to enter particular C-States more often than ofters and other programs won't, power usage depends on C-States as well as on wakeups. CPU frequency and voltage, throttling and other ACPI features have an impact on power of you CPU usage as well.
Your conclusion that a process with 35.2% wakeup-causing eats up .352*13W (in your example) is also absolutely wrong - the CPU is not the only device in your computer eating up power. Every chip needs power and the display (if you have a laptop) needs most of the power! PowerTOP only shows you what is waking your CPU and calculates power from ACPI battery stats (I think so), they show how many mAh your battery has left and how many mA the computer needs at the moment - based on that it calculates your remaining battery time and current power usage in W. (P=U*I, P is Power in watt, U is voltage in volts and I is current in ampere - voltage of your battery is 12 V ) So there is no way to know anything about the things you want to know with PowerTOP, sorry. Peter Ganzhorn On Tue, 2007-05-22 at 14:36 +0800, Ocean Spring wrote: > hello all, > > recently i looked into powertop. it is a nice piece of work indeed. > i have some problem > > for example: > > Wakeups per second : 193.6 > Power usage (ACPI estimaate) : 13.0w (6 hours left) > > top cause for wakeups: > 35.2 % <interrupt>: i8042 > 28.4% <interrupt>: yenta, [EMAIL PROTECTED]:000:00:02.0 > 10% xorg: do_setitimer (it_real_fn) > 8% firebox-bin: bla bla > 2.1% blabla: bla bla > > > 1) > i want to know the relationship between wakeups and the watts > > > 2)is it correct to make conclusion for such as > the power consumption of <interrrupt>i8042 is ( 35.2% x 13 watt) in > this above case? > > > thank you > > > yours > > dev > > > > > > > > > > _______________________________________________ > Power mailing list > [email protected] > http://www.bughost.org/mailman/listinfo/power _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
