Comment 9 for bug 1211700

Interestingly same problem with software rendering (GBM_ALWAYS_SOFTWARE=1):

Client:
[2017-02-23 15:27:04.483795] perf: mir_demo_client_egltriangle: 107.24 FPS, render time 9.16ms, buffer lag 27.72ms (4 buffers)
[2017-02-23 15:27:05.487787] perf: mir_demo_client_egltriangle: 137.58 FPS, render time 7.12ms, buffer lag 21.46ms (4 buffers)
[2017-02-23 15:27:06.494955] perf: mir_demo_client_egltriangle: 101.29 FPS, render time 9.72ms, buffer lag 30.37ms (4 buffers)
[2017-02-23 15:27:07.503672] perf: mir_demo_client_egltriangle: 106.15 FPS, render time 9.27ms, buffer lag 26.98ms (4 buffers)
[2017-02-23 15:27:08.505853] perf: mir_demo_client_egltriangle: 147.70 FPS, render time 6.60ms, buffer lag 20.29ms (4 buffers)
[2017-02-23 15:27:09.507812] perf: mir_demo_client_egltriangle: 128.87 FPS, render time 7.60ms, buffer lag 15.45ms (4 buffers)

Server:
[2017-02-23 15:27:03.626119] compositor: Display 0x7ff2440008c0 averaged 1.049 FPS, 943.246 ms/frame, latency 1.800 ms, 2 frames over 1.905 sec, 0% bypassed
[2017-02-23 15:27:05.630513] compositor: Display 0x7ff2440008c0 averaged 0.997 FPS, 994.407 ms/frame, latency 0.811 ms, 2 frames over 2.004 sec, 0% bypassed
[2017-02-23 15:27:07.450491] compositor: Display 0x7ff2440008c0 averaged 1.098 FPS, 897.537 ms/frame, latency 1.111 ms, 2 frames over 1.819 sec, 0% bypassed
[2017-02-23 15:27:08.524524] compositor: Display 0x7ff2440008c0 averaged 0.931 FPS, 1063.914 ms/frame, latency 1.862 ms, 1 frames over 1.074 sec, 0% bypassed
[2017-02-23 15:27:09.530076] compositor: Display 0x7ff2440008c0 averaged 0.994 FPS, 1001.222 ms/frame, latency 1.750 ms, 1 frames over 1.005 sec, 0% bypassed