Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24

["K.R. Foley" <kr@cybsft.com>]

Ingo Molnar wrote:
> * K.R. Foley <kr@cybsft.com> wrote:
>
>
> > Ingo Molnar wrote:
> >
> > > * Daniel Walker <dwalker@mvista.com> 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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