fsl booke MM vs. SMP questions

[Benjamin Herrenschmidt]

On Mon, 2007-05-28 at 12:23 +0200, Gabriel Paubert wrote:
> On SMP with single die and integrated memory controllers (PASemi), 
> I'd bet that tlb invalidation broadcast is typically much cheaper 
> since no external signals are involved (from a hardware point of view
> it's not very different from a store to a shared cache line that has 
> to be invalidated in the cache of the other processors). 

Except that is often has strong locking requirements along with a race
or two to deal with when not having a HW reload on the TLB. So in the
case of Freescale BookE, it is really something that should be measured.

Ben.