Comment 0 for bug 1388490
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| Daniel van Vugt (vanvugt) wrote Frame rate is artificially low on some systems | #0 |
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Running a server and a few clients on an Atom N270 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 becomes perfectly smooth ~60 FPS.
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