** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1388490
Title:
Frame rate is artificially low on Diamondville Intel Atom systems due
to aggressive power management
Status in Mir:
Fix Committed
Status in mir package in Ubuntu:
New
Bug description:
Running a server and a few clients on an Atom N270 (requires vivid) is
very stuttery and apparently limited to around 20 FPS.
However this limitation is a bug. Firstly I notice the system is still
70% idle according to top. And if I drag the mouse constantly over a
surface or move a window constantly, the rendering (of everything)
becomes perfectly smooth ~60 FPS. Also using --compositor-report=log
on the Mir server shows the compositor render time even on this very
weak machine is only 2.6ms.
So we have a scheduling problem and forcing re-compositing via input
is working around it. Obviously the clients themselves are not able to
wake up the compositor frequently enough to ensure new frames get
scheduled. However if I wake up the compositor using demo-shell mouse
gestures then all is fast and smooth.
This seems to be the same kind of scheduling problem also observed on
higher-end systems when the compositor buffer pipeline is reduced -->
bug 1377872
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