drm/i915/selftests: Disable C-states when measuring RPS frequency response
Let's isolate the impact of cpu frequency selection on determing the GPU throughput in response to selection of RPS frequencies. For real systems, we do have to be concerned with the impact of integrating c-states, p-states and rp-states, but for the sake of proving whether or not RPS works, one baby step at a time. For the record, as one would hope, it does not seem to impact on the measured performance, but we do it anyway to reduce the number of variables. Later, we can extend the testing to encourage the the cpu/pkg to try and sleep while the GPU is busy. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200421142236.8614-1-chris@chris-wilson.co.uk Link: https://patchwork.freedesktop.org/patch/msgid/20200421142236.8614-1-chris@chris-wilson.co.uk
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