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SubjectRe: [patch] recover lost ticks
Date
> > > 	1) On Cyrix/IBM/Centaur the TSC will stop if Suspend-on-Halt is
> > > enabled and a HLT is executed. This is usually a very good
> > > thing since power comsuption goes down dramatically, but
> > > the time code has to compensate (and does since somewhere in
> > > 2.1.12x).
> >
> > This is just bad TSC design. There is nothing good about it.
>
> Its quite sensible design. Think about it harder. Think about APM bios
> driven suspend to disk. Think about future Linux handling of ACPI
> disk suspend states.
>
> Think about x86 laptops that slow the clock.
>
> The TSC code has to handle all these cases anyway, so having the CPU
> suspend the TSC hardware and thus stay suspended for another day over
> an intel cpu is worth it.
>

If you're suspending for that long, you ought to shut down the CPU
core completely. I don't buy the argument *that having the TSC shut
down on HLT saves power*; they should have put the TSC in a different
clock domain.

-hpa


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