[deleted] Is 10ms Flip to Photon-Start latency normal?

I tried to collect some latecny information using Oculus Debug Tool and found the data was kinda abnormal.  I was running oculus-client.exe on an i7 + AMD RX480 machine with CV1.  The GPUView traces I captured showed that there was only around 4ms between a present call to the HMD and next VSync.  Could anyone please help explain how the 10ms "Flip to Photon-Start" is calculated...?