Re: rdtsc to mili secs?

Vojtech Pavlik
2000-11-19T22:23:33Z

On Sun, Nov 19, 2000 at 09:24:04PM +0100, Pavel Machek wrote:
> Hi!
>
> > > > 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.
> > > >
> > > > Yes, this is not perfect, but still keep every program quite happy and
> > > > running.
> > >
> > > No. Udelay has just gone wrong and your old ISA xxx card just crashed
> > > whole system. Oops.
> >
> > Yes. But can you do any better than that? Anyway, I wouldn't expect to
> > be able to put my old ISA cards into a recent notebook which fiddles
> > with the CPU speed (or STPCLK ratio).
>
> PCMCIA is just that: putting old ISA crap into modern hardware. Sorry.

Not really, fortunately. There are ISA-sytle NE2000's on PCMCIA, but
1) You know that you have a card there via the PCMCIA services and
2) They're not the old crappy NE2000's that'd die on a random read anyway.

--
Vojtech Pavlik
SuSE Labs