> > * each processor can run on other speed.
>
> not the case on Intel SMP at least.
I thought we are talking about generic code. And I believe this would
be possible even on intel: consider 60MHz but clock and each processor
having different internal clock multiplier.
> > * not all CPUs have tsc. Would using jiffie+get_slow_timeoffset do the
> > trick and still be fast enough on 486?
>
> get_slow() executes in ~6-7 microseconds, we do not want to do that ...
> but then again, this whole issue is only a problem on higly loaded
> ISP's
No. Whole issue is problem as soon as you run qt application (kde*,
qtscape, qweb, ...), which does busy waiting. Because its busy waiting
loop is close, manages to finish in less than jiffie and that means it
is invisible. Authors of qt maybe are not even aware of what they are
doing.
Pavel
-- I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu