[Intel-gfx] [PATCH i-g-t] tests/perf_pmu: Bump measuring duration for semaphores as well

[Chris Wilson]

Quoting Tvrtko Ursulin (2017-11-23 09:24:01)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> As Chris has discover 100ms is not long enough to cover the sampling
> error in general, fix the semaphore subtest as well to measure for
> 500ms.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>

And one value for all batches makes it easier for us to reason about,
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

At least any deviation from that rule deserves comment.
-Chris