* K.R. Foley <kr@xxxxxxxxxx> wrote:
Ingo Molnar wrote:
* Daniel Walker <dwalker@xxxxxxxxxx> wrote:
I observed a situation on a dual xeon where IOAPIC_POSTFLUSH , if on, would actually cause spurious interrupts. It was odd cause it's suppose to stop them .. If there was a lot of interrupt traffic on one IRQ , it would cause interrupt traffic on another IRQ. This would result in "nobody cared" messages , and the storming IRQ line would get shutdown.
This would only happen in PREEMPT_RT .
does it happen with the latest kernel too? There were a couple of things broken in the IOAPIC code in various earlier versions.
Ingo
Is this why I have been able to boot the latest versions without the noapic option (and without noticeable keyboard repeat problems) or has it just been dumb luck?
yes, i think it's related - the IO-APIC code is now more robust than ever, and that's why any known-broken system would be important to re-check.
Ingo