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 <[email protected]>
Cc: Sagar Kamble <[email protected]>
Cc: Eero Tamminen <[email protected]>
Cc: Francisco Jerez <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Michał Winiarski <[email protected]>
---
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
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