RE: drm_cflush_sg() loops for over 3ms - scheduler not running tasks.

2020-01-14 Thread David Laight
From: David Laight > Sent: 13 January 2020 14:35 > > I've been looking at why some RT processes don't get scheduled promptly. > In my test the RT process's affinity ties it to a single cpu (this may not be > such > a good idea as it seems). > > What I've found is that the Intel i915 graphics dri

drm_cflush_sg() loops for over 3ms

2020-01-14 Thread David Laight
I've been looking at why some RT processes don't get scheduled promptly. In my test the RT process's affinity ties it to a single cpu (this may not be such a good idea as it seems). What I've found is that the Intel i915 graphics driver uses the 'events_unbound' kernel worker thread to periodical