[Intel-gfx] [PATCH 6/6] drm/i915: Priority boost for waiting clients

[Tvrtko Ursulin]

On 06/08/2018 11:03, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2018-08-06 10:53:52)
>>
>> On 06/08/2018 09:30, Chris Wilson wrote:
>>> Latency is in the eye of the beholder. In the case where a client stops
>>> and waits for the gpu, give that request chain a small priority boost
>>> (not so that it overtakes higher priority clients, to preserve the
>>> external ordering) so that ideally the wait completes earlier.
>>
>> Going back to my comments made against the new clients boost patch -
>> perhaps if you make it that preemption is not triggered for within
>> internal priority delta maybe it is all acceptable. Not sure how much of
>> the positive effect you observed remains though.
> 
> That entirely defeats the point of being able to preempt within the same
> user priority; so no more "fairness" wrt FQ_CODEL and no more cheating
> here.

In this case postpone these tweaks until after we implement time-slicing? :)

Regards,

Tvrtko