On 28/07/2018 17:46, Chris Wilson wrote:
Here we bump the busyspin for the current request to avoid sleeping and the cost of both idling and downclocking the CPU. Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Sagar Kamble <sagar.a.kamble@xxxxxxxxx> Cc: Eero Tamminen <eero.t.tamminen@xxxxxxxxx> Cc: Francisco Jerez <currojerez@xxxxxxxxxx> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Cc: Ben Widawsky <ben@xxxxxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx> --- drivers/gpu/drm/i915/Kconfig.profile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/Kconfig.profile b/drivers/gpu/drm/i915/Kconfig.profile index de394dea4a14..54e0ba4051e7 100644 --- a/drivers/gpu/drm/i915/Kconfig.profile +++ b/drivers/gpu/drm/i915/Kconfig.profile @@ -1,6 +1,6 @@ config DRM_I915_SPIN_REQUEST_IRQ int - default 5 # microseconds + default 250 # microseconds help Before sleeping waiting for a request (GPU operation) to complete, we may spend some time polling for its completion. As the IRQ may
But the histograms from previous patch do not suggest 250us busy spin gets us into interesting territory. And we have to know the distribution between IRQ and CS spins.
Regards, Tvrtko _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
