Powertop

Powertop

Kernel ：
CONFIG_USB_SUSPEND
CONFIG_TIMER_STATS
CONFIG_CPU_FREQ_STAT

OS：
1. USB autosuspend
echo “auto” > /sys/bus/usb/devices/usb裝置/power/level

2. SATA Aggressive Link Power Management (不知道這是作啥的)
echo “min_power” > /sys/class/scsi_host/host*/link_power_management_policy
(good)

3. Wake on LAN (關閉遠端喚醒)
ethtool -s eth0 wol d

4. Ture down to 100Mbits/sec (如果網路流量沒太大的話，可以減到100M)
ethtool -s eth0 autoneg off speed 100

5. VM Writeback Time (不知道這是作啥的)
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
(good)

6. Filesystem atime
mount -o remount, noatime