On Wednesday, 8 March 2017 11:48:54 UTC+2, J. Kiszka  wrote:
> On 2017-03-03 17:19, Dan Zach wrote:
> > On Friday, 3 March 2017 17:38:27 UTC+2, J. Kiszka  wrote:
> >> On 2017-03-03 16:32, Dan Zach wrote:
> >>> Any observations on the timer list?
> >>>
> >>
> >> Nothing obvious. The only difference is virt vs. phys timer registers,
> >> but those shouldn't make a difference. I will have to reproduce the
> >> setup locally. My TK1 is currently out of reach, but the behaviour
> >> should be ARMv7-generic.
> >>
> >> Could you share your non-root RT kernel config?
> >>
> >> Jan
> >>
> >> -- 
> >> Siemens AG, Corporate Technology, CT RDA ITP SES-DE
> >> Corporate Competence Center Embedded Linux
> > 
> > Please find attached
> > 
> 
> I was able to reproduce on a Banana Pi, but I didn't debug the root
> cause yet. Workaround: try to enable CONFIG_ARM_LPAE in the non-root
> cell kernel config.
> 
> Jan
> 
> -- 
> Siemens AG, Corporate Technology, CT RDA ITP SES-DE
> Corporate Competence Center Embedded Linux

Tried with CONFIG_ARM_LPAE on in the non-root linux. The minimal time is still 
around 40 uS, when the root cell is stressed, worse case is 700us

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