Re: How to debug outliers in `wb_wait_for_completion()` in `ksys_sync()`?

Dear Linux folks, On 08/28/18 07:27, Paul Menzel wrote: > Using `sleepgraph.py` [1][2] to profile the suspend to RAM (STR) > times, shows that `ksys_enter` takes a noticeable amount of time. > > 13 ms on a TUXEDO Book BU1406 with the NVMe device *SAMSUNG > MZVKW512HMJP-0*, which is quite go

How to debug outliers in `wb_wait_for_completion()` in `ksys_sync()`?

Dear Linux folks, Using `sleepgraph.py` [1][2] to profile the suspend to RAM (STR) times, shows that `ksys_enter` takes a noticeable amount of time. 13 ms on a TUXEDO Book BU1406 with the NVMe device *SAMSUNG MZVKW512HMJP-0*, which is quite good, and over a 60 ms on ASRock E350M1 with a