** Changed in: ubuntu-power-consumption
Status: New => Incomplete
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1236508
Title:
unity8+Mir draws more current and wakes up 100 times more often than
unity8 with surfaceflinger
Status in Mir:
Incomplete
Status in The Ubuntu Power Consumption Project:
Incomplete
Status in Unity Mir:
Incomplete
Status in “unity8” package in Ubuntu:
Incomplete
Bug description:
I've looked at the CPU, wakeup event and current drawn on a LG Nexus 4
comparing the Mir enabled and non-Mir versions of Unity8 with today's
image + updates (at 18:00 UTC, 7th Oct 2013).
I ran a 5 minute idle soak test with the screen set to be un-blanked
at full brightness and measured the current drawn at 0.5 second
intervals. The Mir enabled version of Unity is drawing on average
~143.7mA where as the non-Mir version is drawing 138.7mA, or around
5mA less current (~3.6% difference)
Measuring CPU load (just Mir)
Mir:
0.70% user, 0.63% system, 1.33% total CPU usage
Non-Mir:
0.17% user, 0.07% system, 0.23% total CPU usage
Context Switches:
Mir:
219.24 context switches/sec
Non-Mir:
22.32 context switches/sec
poll/epoll/nanosleeps
Mir:
4.9664/sec
Non-Mir:
3.1333/sec
Total CPU of system:
Mir:
0.87%
Non-Mir:
0.70%
So it seems that the Mir variant of Unity8 is busier and consumes more
power than the non-Mir variety when idle.
To manage notifications about this bug go to:
https://bugs.launchpad.net/mir/+bug/1236508/+subscriptions
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