On Tue, May 10, 2005 at 01:54:53PM +0200, Bernd Paysan wrote:
On Tuesday 10 May 2005 13:12, Andi Kleen wrote:
So that explains why nobody sees this problem. But the TSC-based fallback timekeeping is still broken on SMP systems with PowerNow and distributed IRQ handling, which both together seem to be rare enough ;-).
There is a patch pending for the TSC problem - using the pmtimer instead in this case.
But the distributed timer interrupt problem is weird. It should not happen. You sure it was IRQ 0 that was duplicated and not "LOC" ?
Yes. Only one CPU actually gets and handles the timer interrupt, but which one is somewhat random (for about 10 seconds, it's the same CPU, then it switches over).
That could be irqbalance doing its thing. Does it go away when you stop it? -Andi