Re: rdtsc to mili secs?

H. Peter Anvin
2000-11-16T23:40:07Z

Followup to: <20001116115730.A665@suse.cz>
By author: Vojtech Pavlik <vojtech@suse.cz>
In newsgroup: linux.dev.kernel
>
> Anyway, this should be solvable by checking for clock change in the
> timer interrupt. This way we should be able to detect when the clock
> went weird with a 10 ms accuracy. And compensate for that. It should be
> possible to keep a 'reasonable' clock running even through the clock
> changes, where reasonable means constantly growing and as close to real
> time as 10 ms difference max.
>

Actually, on machines where RDTSC works correctly, you'd like to use
that to detect a lost timer interrupt.

It's tough, it really is :(

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."