Re: [Intel-gfx] [PATCH] drm/i915: Expose the busyspin durations for i915_wait_request

2017-11-24 Thread Chris Wilson
Quoting Tvrtko Ursulin (2017-11-24 16:44:21) > > On 24/11/2017 14:54, Chris Wilson wrote: > > An interesting discussion regarding "hybrid interrupt polling" for NVMe > > came to the conclusion that the ideal busyspin before sleeping was half > > of the expected request latency (and better if it wa

Re: [Intel-gfx] [PATCH] drm/i915: Expose the busyspin durations for i915_wait_request

2017-11-24 Thread Tvrtko Ursulin
On 24/11/2017 14:54, Chris Wilson wrote: An interesting discussion regarding "hybrid interrupt polling" for NVMe came to the conclusion that the ideal busyspin before sleeping was half of the expected request latency (and better if it was already halfway through that request). This suggested tha

[Intel-gfx] [PATCH] drm/i915: Expose the busyspin durations for i915_wait_request

2017-11-24 Thread Chris Wilson
An interesting discussion regarding "hybrid interrupt polling" for NVMe came to the conclusion that the ideal busyspin before sleeping was half of the expected request latency (and better if it was already halfway through that request). This suggested that we too should look again at our tradeoff b