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

Bob Paauwe bob.j.paauwe at intel.com
Tue Apr 23 18:05:24 UTC 2019

On Tue, 16 Apr 2019 16:56:26 +0100
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> 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?
> -Chris

To follow up and close this.  When I requested more details on the use
case and data for this request, I was informed that a different
solution is being pursued and this patch is no longer needed.

Thanks for the reviews and comments.

Bob Paauwe                  
Bob.J.Paauwe at intel.com
IOTG / PED Software Organization
Intel Corp.  Folsom, CA
(916) 356-6193    

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