[Intel-gfx] [PATCH v4] drm/i915: Execlists small cleanups and micro-optimisations

[Chris Wilson]

On Mon, Feb 29, 2016 at 10:45:34AM +0000, Tvrtko Ursulin wrote:
> This ok?
> 
> """
> One unexplained result is with "gem_latency -n 0" (dispatching
> empty batches) which shows 5% more throughput, 8% less CPU time,
> 25% better producer and consumer latencies, but 15% higher
> dispatch latency which looks like a possible measuring artifact.
> """

I doubt it is a measuring artefact since throughput = 1/(dispatch +
latency + test overhead), and the dispatch latency here is larger than
the wakeup latency and so has greater impact on throughput in this
scenario.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre