It appears Unity8 is unthrottled, as in swap interval 0. So when I drag a window around rapidly it matches the USB mouse event rate rather than the display's refresh rate. MIR_CLIENT_PERF_REPORT shows:
[2017-02-02 10:29:02.531811] perf: : 131.00 FPS, render time 7.61ms, buffer lag 22.92ms (4 buffers) [2017-02-02 10:29:03.547757] perf: : 119.21 FPS, render time 8.36ms, buffer lag 25.21ms (4 buffers) [2017-02-02 10:29:04.551850] perf: : 95.61 FPS, render time 10.42ms, buffer lag 31.74ms (4 buffers) [2017-02-02 10:29:05.564508] perf: : 96.83 FPS, render time 10.30ms, buffer lag 30.72ms (4 buffers) [2017-02-02 10:29:06.579804] perf: : 94.58 FPS, render time 10.54ms, buffer lag 31.32ms (4 buffers) [2017-02-02 10:29:07.583854] perf: : 95.61 FPS, render time 10.42ms, buffer lag 32.15ms (4 buffers) [2017-02-02 10:29:08.584909] perf: : 131.86 FPS, render time 7.55ms, buffer lag 22.92ms (4 buffers) [2017-02-02 10:29:09.589854] perf: : 107.56 FPS, render time 9.26ms, buffer lag 27.92ms (4 buffers) [2017-02-02 10:29:10.603679] perf: : 120.43 FPS, render time 8.28ms, buffer lag 24.52ms (4 buffers) [2017-02-02 10:29:11.619541] perf: : 117.24 FPS, render time 8.50ms, buffer lag 25.68ms (4 buffers) [2017-02-02 10:29:12.628505] perf: : 120.03 FPS, render time 8.31ms, buffer lag 25.00ms (4 buffers) [2017-02-02 10:29:13.635706] perf: : 93.34 FPS, render time 10.67ms, buffer lag 31.79ms (4 buffers) [2017-02-02 10:29:14.643575] perf: : 122.14 FPS, render time 8.16ms, buffer lag 24.94ms (4 buffers) [2017-02-02 10:29:15.643621] perf: : 93.00 FPS, render time 10.72ms, buffer lag 32.28ms (4 buffers) [2017-02-02 10:29:16.647720] perf: : 108.56 FPS, render time 9.18ms, buffer lag 27.95ms (4 buffers) [2017-02-02 10:29:17.648820] perf: : 92.90 FPS, render time 10.73ms, buffer lag 32.17ms (4 buffers) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1661128 Title: [regression] Unity8 stutters constantly (like half frame rate) Status in Canonical System Image: New Status in Mir: New Status in unity8 package in Ubuntu: New Bug description: Unity8 stutters constantly (like half frame rate) on an i7 desktop. This regression only happened recently, perhaps due to the introduction of Mir 0.26.0. Surprisingly though, using the same Mir release I can start a demo server on another VT and everything is silky-smooth. The problem only seems to occur with Unity8. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1661128/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
