Linux-kernel mailing list archive 2000-47,: Re: rdtsc to mili secs?

# Re: rdtsc to mili secs?

Vojtech Pavlik (vojtech@suse.cz)
Sun, 19 Nov 2000 10:21:43 +0100

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On Sat, Nov 18, 2000 at 03:48:06PM -0800, H. Peter Anvin wrote:
> Followup to: <20001118211349.B382@bug.ucw.cz>
> By author: Pavel Machek <pavel@suse.cz>
> In newsgroup: linux.dev.kernel
>
> > > 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 :(
> >
> > Well, my patch did not do that but you probably want lost timer
> > interrupt detection so that you avoid false alarms.
> >
> > But that means you can no longer detect speed change after 10msec:
> >
> > going from 150MHz to 300MHz is very similar to one lost timer
> > interrupt.
> >
>
> That's the point.

... and, you still can have both - detection of lost timer interrupts
and detection of speed changing. It'll take longer than 10ms to notice,
though (I think 20 or 30 will just do it).

    --
    Vojtech Pavlik
    SuSE Labs
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