ULE/sched issues on stable/9 - why isn't preemption occuring?

[Adrian Chadd]

Hi,

That's cool and one of the things I'm using this to investigate.

However, I'm still seeing weird TSC behaviour, which I'd like to
finish trying to root cause before moving onto bigger and weirder
things.

I'm not sure how feasible it'd be to "make" KTR work with power saving
modes enabled on these older model CPUs. John/Doug has pointed out
later CPUs have P-state invariant TSC counters, which would render all
of this moot. Great, but that's not the test hardware I have. :-)



Adrian