Re: [Intel-gfx] [PATCH] drm/i915/execlists: Micro-optimise "idle" context switch

2018-08-17 Thread kbuild test robot
Hi Chris, Thank you for the patch! Yet something to improve: [auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on v4.18 next-20180817] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/

Re: [Intel-gfx] [PATCH] drm/i915/execlists: Micro-optimise "idle" context switch

2018-08-17 Thread kbuild test robot
Hi Chris, Thank you for the patch! Yet something to improve: [auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on v4.18 next-20180817] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/

[Intel-gfx] [PATCH] drm/i915/execlists: Micro-optimise "idle" context switch

2018-08-17 Thread Chris Wilson
On gen9, we see an effect where when we perform an element switch just as the first context completes execution that switch takes twice as long, as if it first reloads the completed context. That is we observe the cost of context1 -> idle -> context1 -> context2 as being twice the cost o