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

[Peter Zijlstra]

On Wed, Apr 11, 2018 at 09:26:11AM -0700, Francisco Jerez wrote:
> "just like" here is possibly somewhat unfair to the schedutil governor,
> admittedly its progressive IOWAIT boosting behavior seems somewhat less
> wasteful than the intel_pstate non-HWP governor's IOWAIT boosting
> behavior, but it's still largely unhelpful on IO-bound conditions.

So you understand why we need the iowait boosting right?

It is just that when we get back to runnable, we want to process the
next data packet ASAP. See also here:

  https://lkml.kernel.org/r/20170522082154.f57cqovterd2qajv@hirez.programming.kicks-ass.net

What I don't really understand is why it is costing so much power; after
all, when we're in iowait the CPU is mostly idle and can power-gate.