[Intel-gfx] [PATCH] RFC drm/i915: Slaughter the thundering i915_wait_request herd

[Chris Wilson]

On Tue, Nov 03, 2015 at 01:31:22PM +0000, Gong, Zhipeng wrote:
> 
> > From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
> > 
> > Do you also have a relative perf statistics like op/s we can compare to make
> > sure we aren't just stalling the whole system?
> > 
> Could you please provide the commands about how to check it?

I was presuming your workload has some measure of efficiency/throughput?
It is one thing to say we are using 10% less CPU (per second), but the
task is running 2x as long!

> > How much cpu time is left in the i915_wait_request branch? i.e. how close to
> > the limit are we with chasing this path?
> Could you please provide the commands here either? :)

Check the perf callgraph.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre