RE: VIA KT400 + Kernel 2.6.12 + IO-APIC + uhci_hcd = IRQ trouble

["Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>]

> > Le Lundi 25 Juillet 2005 22:44, Alan Stern a écrit :
> > >
> > > Now that's strange.  When you plug the high-speed device into the 
> > > integrated ports, which IRQ counter changes?  Since 
> nothing is using 
> > > IRQ 21, it should be disabled and its counter should remain 
> > > constant.  Does this mean the interrupts show up on IRQ 
> 19 (used by 
> > > ehci-hcd), or do they not show up at all (i.e., is the 
> USB connection just being polled)?
> > 
> > I assume it's IRQ 19.
> > 
> > cat /proc/interrupts doesn't show IRQ21 at all when uhci 
> isn't loaded.
> 
> As it shouldn't, since nothing is supposed to be using that IRQ.
> 
> > IRQ 19 being shared with 4 IDE controllers that controls my hard 
> > drives, that's hard to isolate interrupts counts due to USB 
> activity 
> > from interrupts counts due to disks activity...
> 
> I was afraid you'd say that...
> 
> Natalie, that's all I can think of.  Now it's up to you to 
> invent a patch Michel can try out, to show just where the 
> IO-APIC code is going wrong.

I will sure try... I'm keeping an eye on your exchange don't worry :) 
just have to get done with urgent work piled up here while on my trip :< ...

--N
 
> Alan Stern
> 
> 
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