https://bugs.freedesktop.org/show_bug.cgi?id=38800
--- Comment #13 from Simon Farnsworth simon.farnsworth@onelan.co.uk 2011-07-05 05:24:19 PDT --- Created an attachment (id=48768) --> (https://bugs.freedesktop.org/attachment.cgi?id=48768) drm.debug=0xf dmesg snippet, showing timings of page flips
PID 955 is Xorg, PID 1360 is my test program. Notice that everything blocks after Xorg calls the pageflip ioctl until over 16ms have passed - as if we are blocking in the pageflip unexpectedly.