Re: [Intel-gfx] [PATCH i-g-t] i915/perf_pmu: Compare semaphore and busy measurements

2019-09-25 Thread Tvrtko Ursulin
On 24/09/2019 23:01, Chris Wilson wrote: Our semaphore time is measured by sampling a ring register, whereas our busy time is measured exactly. This leaves a window of discrepancy that we wish to keep small (at least within sample tolerance). References:

[Intel-gfx] [PATCH i-g-t] i915/perf_pmu: Compare semaphore and busy measurements

2019-09-24 Thread Chris Wilson
Our semaphore time is measured by sampling a ring register, whereas our busy time is measured exactly. This leaves a window of discrepancy that we wish to keep small (at least within sample tolerance). References: https://bugs.freedesktop.org/show_bug.cgi?id=111788 Signed-off-by: Chris Wilson