Public bug reported:
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.
** Affects: unity8 (Ubuntu)
Importance: Undecided
Status: New
** Package changed: ubuntu => unity8 (Ubuntu)
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https://bugs.launchpad.net/bugs/1236508
Title:
unity8 (+Mir) draws more current and uses more CPU than non-Mir
variant
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