> I've not calibrated to verify but that seems to be what the picture is
> showing so there is some chance the time base is off.  All the
instruction
> trace is there to walk it if necessary.  There have been some comments
> about NO_HZ adding some overhead from those who measure MHz around
here
> for things like MP3 load models.  I hadn't looked very closely.

One question might be is if the timekeeping could be deferred until
after you have serviced the IRQ.  Is there a reason to make the ISR wait
for housekeeping?

Regards,
Richard W.
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