for the purposes of the power usage benchmarking, I don't see a need for accurate measurements of the laptop sans the power supply.
Originally Posted by chithanh
power draw will still increase from the wall when using the newer kernels that aren't regulating the system properly.
for that matter, this has a lot of interest for servers as well as mobile. When you are running 400+ linux servers in a datacenter, you don't want to upgrade to something that will multiply your power usage draw.
for a laptop it goes up a couple watts, for a datacenter it goes up a kilowatt or more...
It is even worse. Imagine the following hypothetical and completely made up situation: The system firmware can perform function X using interrupts or busy-waiting. Using busy-waiting, performance in GPU-bound 3dMark06 is 0.1% higher, but power consumption increases due to CPU load. In order to look better in benchmarks, the manufacturer switches between interrupts while on battery power and busy-waiting while on AC power.
Now two regressions are independently introduced in the kernel, regression A causes more power consumption for the interrupt case and regression B causes more power consumption in the busy-wait case.
What mobile users care about is regression A, but testing on AC power only finds regression B.
For datacenters, you need to plan power supply and cooling according to TDP/peak power consumption anyway, so I don't think it will have a dramatic impact.
Originally Posted by Lederhosen
Last edited by chithanh; 06-20-2011 at 12:29 PM.
At datacenters, they don't use much laptops. A desktop or server does not have the advanced power management a laptop has, and is affected much less.
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