On Tue, 18 Sep 2018, Thomas Gleixner wrote:
> So if the TSC on CPU1 is slightly behind the TSC on CPU0 then now1 can be
> smaller than cycle_last. The TSC sync stuff does not catch the small delta
> for unknown raisins. I'll go and find that machine and test that again.
Of course it does not trigger anymore. We accumulated code between the
point in timekeeping_advance() where the TSC is read and the update of the
VDSO data.
I'll might have to get an 2.6ish kernel booted on that machine and try with
that again. /me shudders
Thanks,
tglx
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