Slashdot videos: Now with more Slashdot!
Now Arjan van de Ven has come up with a tool named powertop that points the finger directly at which applications and device drivers are draining your laptop battery by waking the CPU from idle hundreds of times per second.
Low power states on modern processors can save significant amounts of power, but only if the cpu stays in the low power state for long enough to amortize the energy used to get into and out of the low power state. Powertop reports the total number of times the cpu is woken each second, the average time spent in each C-state, and the top ten offenders who wake the CPU from its slumbers.
Keith Packard reported that by using this tool to fix or eliminate the worst offenders he increased his battery life from four hours to almost seven!"
The ban, which takes place immediately, actually was imposed in February and was not prompted by any event or study, according to Army Col. Gary Keck, a Defense Department spokesman. He confirmed that bandwidth was the issue and said the decision is "not about content."
The new policy takes effect as the military has, ironically, aggressively turned to YouTube as a means of broadcasting what it considers to be the more positive aspects of its work in Iraq and Afghanistan as a way of countering what it considers to be negative news coverage.
The sites blocked by the Defense Department: MySpace, YouTube, Metacafe, IFilm, StupidVideos, FileCabi, BlackPlanet, hi5, Photobucket, Pandora, MTV, 1.fm and Live365."