## No performance difference, don't use zram
# Unmount if needed
#mount | grep /var/tmp/portage && umount /var/tmp/portage
# Reset size and free allocated memory
#echo 1 > /sys/block/zram0/reset
# Initialize /dev/zram0 with 4GB disksize
#echo $((4*1024*1024*1024)) > /sys/block/zram0/disksize
#mkfs.btrfs /dev/zram0
#mount -o noatime,nobarrier /dev/zram0 /var/tmp/portage

## Power management suggested by powertop

# wireless power saving
iwconfig wlan0 power timeout 500ms

# SATA ALPM link power management
for device in /sys/class/scsi_host/*; do
	echo min_power > ${device}/link_power_management_policy
done

# USB autosuspend for non-input devices
for device in /sys/bus/usb/devices/*; do
	driver=$(basename $(readlink -f ${device}/driver))
	[[ ${driver} == "usbhid" || ${driver} == "hub" ]] && continue
	[[ -e ${device}/power/control ]] \
		&& echo auto > ${device}/power/control
done

# HD audio power-saving
echo 1 > /sys/module/snd_hda_intel/parameters/power_save

# VM dirty writeback time
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs