Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

[Maciej W. Rozycki]

On Fri, 15 Jul 2005, Andi Kleen wrote:

> >  That's like scratching your left ear with your right hand -- broadcasting 
> > that external timer interrupt in the first place is more straightforward.  
> > If you want to exclude CPUs from the list of receivers, just use the 
> > logical destination mode appropriately.
> 
> The problem with that is that it would need regular synchronizations
> of all CPUs to coordinate this.   Not good for scalability and I 
> believe the fundamentally wrong way to do this.

 What to you mean by "regular synchronizations of all CPUs?"  And how is a 
broadcasted external timer interrupt different from a unicasted one 
redistributed further via an all-but-self IPI, except from removing an 
unnecessary burden from the CPU targeted by the unicast interrupt?

  Maciej
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