Interrupt redirection problem

Mike> Is this to say that the BSP handling >90% of the interrupts is Mike> normal or OK?

For some reason, my earlier response to Andreas's question didn't make it to the list, so I'm repeating it here: it is indeed normal for a single CPU to receive most of the interrupts. The way this works is that normally all CPUs use an external task priority (xtp) of "normal". When a CPU runs its idle task, it lowers the xtp to "low" and thereby actively solicits interrupt delivery to itself. Now, when the xtp across all CPUs is the same, the chipset gets to chose which CPU to deliver an interrupt to. IIRC, the 460gx in that case picks the CPU which was programmed into the I/O SAPIC. On Linux, that is by default the CPU that installed the interrupt handler. And since most interrupt handlers are installed by the bootstrap processor, you normally see most interrupts coming in on CPU 0.

	--david