Re: Re: Disabling lapic timer for a certain core

[Thomas Gleixner <tglx@linutronix.de>]

On Fri, 5 Mar 2010, M. Koehrer wrote:
> > In theory it's possible to remove the timer interrupt from such an
> > isolated core completely, but there needs to be some work done vs. the
> > scheduler, accounting, RCU etc. There are people looking into this,
> > but we have no patches yet.
> I have checked the LAPIC addresses via the MSRs.
> All LAPIC addresses for all CPU cores are the same. 
> I assume they share the very same configuration, thus a minimum step 
> would be to make a copy of this configuration data and to let CPU core 3
> point to this copy. This would allow to disable the timer.

Really ? If it would be enough to disable the timer interrupt and not
let it fire, it would have been done years ago.

Did you even try to read what I said above ?

> >                 ...., but there needs to be some work done vs. the
> > scheduler, accounting, RCU etc.

Linux was not designed that way and it requires a non trivial amount
of work to get this sorted out:

> > There are people looking into this, but we have no patches yet.

Thanks,

	tglx