Power Management

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Matthew Garrett's "[http://www.codon.org.uk/~mjg59/power/good_practices.html Observations on Power Management]" is a great intro.

==Implementations==

* APM (Advanced Power Management): All PM policy/mechanism resides within the BIOS

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* P4 Thermal Throttling: Slows down or shuts off the processor based on CPU temperature

** Adjustment is either via idle cycle insertion or lowering the clock multiplier

==Batteries==

* upower can be used to get battery details, if its daemon is running:

<pre>upower -i /org/freedesktop/UPower/devices/battery_BAT1

native-path: BAT1

vendor: SMP

model: 01AV452

serial: 5642

power supply: yes

updated: Sun 15 Jul 2018 12:33:08 PM EDT (104 seconds ago)

has history: yes

has statistics: yes

battery

present: yes

rechargeable: yes

state: discharging

warning-level: none

energy: 15.94 Wh

energy-empty: 0 Wh

energy-full: 24.54 Wh

energy-full-design: 24 Wh

energy-rate: 7.994 W

voltage: 11.405 V

time to empty: 2.0 hours

percentage: 66%

capacity: 100%

technology: lithium-polymer

icon-name: 'battery-full-symbolic'

History (charge):

1531672388 66.000 discharging

History (rate):

1531672388 7.994 discharging</pre>

==CPU Frequency==

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==Disks/Filesystems==

* noatime -- critical for all kinds of things! don't believe me; trust [http://article.gmane.org/gmane.linux.kernel/565148 ingo ~~molnar~~]:

* noatime -- critical for all kinds of things! don't believe me; trust [http://article.gmane.org/gmane.linux.kernel/565148 ingo molnár]:

<pre>i cannot over-emphasise how much of a deal it is in practice. Atime

updates are by far the biggest IO performance deficiency that Linux has

Power Management: Difference between revisions

Dank (talk | contribs)

@@ Line 1: / Line 1: @@
+Matthew Garrett's "[http://www.codon.org.uk/~mjg59/power/good_practices.html Observations on Power Management]" is a great intro.
 ==Implementations==
 * APM (Advanced Power Management): All PM policy/mechanism resides within the BIOS
@@ Line 8: / Line 9: @@
 * P4 Thermal Throttling: Slows down or shuts off the processor based on CPU temperature
 ** Adjustment is either via idle cycle insertion or lowering the clock multiplier
+==Batteries==
+* upower can be used to get battery details, if its daemon is running:
+<pre>upower -i /org/freedesktop/UPower/devices/battery_BAT1
+  native-path:          BAT1
+  vendor:               SMP
+  model:                01AV452
+  serial:               5642
+  power supply:         yes
+  updated:              Sun 15 Jul 2018 12:33:08 PM EDT (104 seconds ago)
+  has history:          yes
+  has statistics:       yes
+  battery
+    present:             yes
+    rechargeable:        yes
+    state:               discharging
+    warning-level:       none
+    energy:              15.94 Wh
+    energy-empty:        0 Wh
+    energy-full:         24.54 Wh
+    energy-full-design:  24 Wh
+    energy-rate:         7.994 W
+    voltage:             11.405 V
+    time to empty:       2.0 hours
+    percentage:          66%
+    capacity:            100%
+    technology:          lithium-polymer
+    icon-name:          'battery-full-symbolic'
+  History (charge):
+    1531672388	66.000	discharging
+  History (rate):
+    1531672388	7.994	discharging</pre>
 ==CPU Frequency==
@@ Line 50: / Line 83: @@
 ==Disks/Filesystems==
-* noatime -- critical for all kinds of things! don't believe me; trust [http://article.gmane.org/gmane.linux.kernel/565148 ingo molnar]:
+* noatime -- critical for all kinds of things! don't believe me; trust [http://article.gmane.org/gmane.linux.kernel/565148 ingo molnár]:
 <pre>i cannot over-emphasise how much of a deal it is in practice. Atime
 updates are by far the biggest IO performance deficiency that Linux has