[Intel-gfx] Increased latency from removal of GEM_THROTTLE in 2D driver

[Chris Wilson]

On Sat, 06 Nov 2010 01:44:59 +0000, Peter Clifton <pcjc2 at cam.ac.uk> wrote:
> Presumably this says something bad about my app, or its benchmarking
> code. Any clues as to what that is?
> 
> Without the commit, I can use other X11 apps whilst my PCB program is
> benchmarking. With it, the X11 server graphics almost completely freeze
> up.

Do you get a similar effect with the THROTTLE in the ddx and a recent
kernel (2.6.37-rc1 or drm-intel-next)? Those kernels should only penalize
the caller of THROTTLE and so X should not end up blocking your app.

I can feel a new tracepoint coming: throttle-begin, throttle-end.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre