[Intel-gfx] [PATCH] drm/i915: Configurable GT idle frequency

Chris Wilson chris at chris-wilson.co.uk
Tue Apr 16 15:56:26 UTC 2019

Quoting Bob Paauwe (2019-04-16 00:05:26)
> There are real-time use cases where having deterministic CPU processes
> can be more important than GPU power/performance. Parking the GPU at a
> specific freqency by setting idle, min and max prohibits the normal
> dynamic GPU frequency switching which can introduce significant PCI-E
> latency. This adds the ability to configure the GPU "idle" frequecy
> using the same method that already exists for minimum and maximum
> frequencies.

What exactly is the problem? We never use idle frequency while active,
always restarting at max(cur, rpe). So for the simple minded among us,
where is the igt demonstrating the issue?

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