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Some PowerTOP updates

Nov 17, 2009, 14:33 (0 Talkback[s])

"Test 1: Who is spinning up the disk Not everyone has an SSD in their system yet (I feel sorry for those who don't). The mechanical rotation of a disk seems to cost in the order of 0.5 Watts to 1 Watt of power (depending on the disk).

"For this reason, pretty much all laptop disks will stop spinning after several seconds of inactivity.

"Now, to enjoy this power savings, it is essential that the disk gets to actually spin down, that is, that there are long periods of inactivity. In a typical Linux distribution, there are various programs that, unfortunately, write things to the disk all the time. Until now, the only way to find out which programs were doing this was to use the blockdump kernel feature."

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