[Intel-gfx] vlv punit and sideband tidy
While we continue to observe hangs even with this w/a in place, I do believe we are in a better position (although that may just be my confirmation bias). I certainly don't think it's all happy yet. Mika believes that if we keep the cpu in C0 whilst the gpu is busy, then it behaves much better -- but that is a very tough sell; virtually disabling cpu powersaving entirely, for the gpu rarely sleeps under the target workloads. Still I think this series moves us forwards and would appreciation acks or an outright nak to drop it. :) -Chris ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] vlv punit and sideband tidy
On Wed, 2018-03-07 at 19:41 +, Chris Wilson wrote: > Mika > believes that if we keep the cpu in C0 whilst the gpu is busy, then > it > behaves much better -- but that is a very tough sell Chris, Mika, I wonder does i915 driver tries to keep CPU in C0 at the moment already or you just consider this? If it is doing anything to CPU while gpu is busy, could you, please, clarify what exactly and point me to the code/key patches? Please, answer from BDW/SKL gen perspective rather than VLV. Dmitry. ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] vlv punit and sideband tidy
Quoting Rogozhkin, Dmitry V (2018-03-07 20:39:16) > On Wed, 2018-03-07 at 19:41 +, Chris Wilson wrote: > > Mika > > believes that if we keep the cpu in C0 whilst the gpu is busy, then > > it > > behaves much better -- but that is a very tough sell > > Chris, Mika, I wonder does i915 driver tries to keep CPU in C0 at the > moment already or you just consider this? That is what Mika looked at, setting C0 while the GPU is marked busy. Iirc, he was satisfied with the result, I just objected on the grounds that keeping the CPU at max frequency was unlikely to win any friends in HTPC. (Although, maybe my gut feeling here is backwards and killawatt reports differently.) > CPU while gpu is busy, could you, please, clarify what exactly and > point me to the code/key patches? Please, answer from BDW/SKL gen > perspective rather than VLV. Basically you do pm_qos_update_request() from i915_request::mark_busy(). -Chris ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
