Ingo Molnar wrote:
* K.R. Foley <[email protected]> wrote:
Ingo Molnar wrote:
* Daniel Walker <[email protected]> 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
Well I have booted -27 a couple of times and -28 once now without
supplying the noapic boot option and I haven't seen any of the keyboard
repeat problems that I reported late last week. This was on my dual 2.6
Xeon w/HT. I have never seen this behavior on any of my older systems.
Because of the fact that the problem showed up sporadically, I can't say
for sure that it is gone. However, so far so good. I will report any
changes that I see.
--
kr
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