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CONFIG_DRM_I915_MAX_REQUEST_BUSYWAIT: Busywait for request completion limit (ns)

General informations

The Linux kernel configuration item CONFIG_DRM_I915_MAX_REQUEST_BUSYWAIT:

Help text

Before sleeping waiting for a request (GPU operation) to complete, we may spend some time polling for its completion. As the IRQ may take a non-negligible time to setup, we do a short spin first to check if the request will complete in the time it would have taken us to enable the interrupt.

This is adjustable via /sys/class/drm/card?/engine/*/max_busywait_duration_ns

May be 0 to disable the initial spin. In practice, we estimate the cost of enabling the interrupt (if currently disabled) to be a few microseconds.



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