[Intel-gfx] [PATCH 0/9] GPU-bound energy efficiency improvements for the intel_pstate driver.

[Peter Zijlstra]

On Thu, Apr 12, 2018 at 12:55:39PM -0700, Francisco Jerez wrote:
> Actually assuming that a single geometric feature of the power curve is
> known -- it being convex in the frequency range allowed by the policy
> (which is almost always the case, not only for Intel CPUs), the optimal
> frequency for an IO-bound workload is fully independent of the exact
> power curve -- It's just the minimum CPU frequency that's able to keep
> the bottlenecking IO device at 100% utilization. 

I think that is difficult to determine with the information at hand. We
have lost all device information by the time we reach the scheduler.