Ubuntu
xorg-server package

Xmir client performance is lower with swap interval 0 than with 1

Bug #1546401 reported by Daniel van Vugt
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
xorg-server (Ubuntu)
Invalid
Medium
Daniel van Vugt

Bug Description

Xmir client performance is lower with swap interval 0 than with 1. Kind of the opposite of what you might expect:

$ Xmir --desktop_file_hint=unity8 -sw &
$ glxgears
13339 frames in 5.0 seconds = 2667.750 FPS
13619 frames in 5.0 seconds = 2723.752 FPS
13653 frames in 5.0 seconds = 2730.425 FPS

$ env MIR_CLIENT_FORCE_SWAP_INTERVAL=0 Xmir --desktop_file_hint=unity8 -sw
$ glxgears
3092 frames in 5.0 seconds = 618.255 FPS
3185 frames in 5.0 seconds = 636.933 FPS
3014 frames in 5.0 seconds = 602.666 FPS

Daniel van Vugt (vanvugt)
Changed in xorg-server (Ubuntu):
assignee: nobody → Daniel van Vugt (vanvugt)
Daniel van Vugt (vanvugt)
Changed in xorg-server (Ubuntu):
importance: Undecided → Medium
status: New → Triaged
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

See also bug 1511278

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Silly me. That's probably correct. By making the Xmir process super-busy with interval 0, the X client will get less CPU and GPU time.

Changed in xorg-server (Ubuntu):
status: Triaged → Invalid
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