http://bugzilla.kernel.org/show_bug.cgi?id=6591
[EMAIL PROTECTED] changed:
What |Removed |Added
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Summary|MSI Master2 dual-Opteron |VIA K8T800 SMP: kernel
|:kernel randomly loses all |randomly loses all
|interrupts from my UHCI or |interrupts from my UHCI or
|SATA controllers. |SATA controllers
------- Additional Comments From [EMAIL PROTECTED] 2006-07-30 16:34 -------
> Does it work before?
As far as I know, yes, but I didn't own any SATA disks and the SATA controller
was disabled in the BIOS. I also don't remember if there was a time period when
I was using SATA and this wasn't happening.
> If you remove USB support in kernel, can you see interrupt lost on SATA?
I tried temporarily blacklisting the uhci-hcd and ehci-hcd modules (which
prevents them from ever being loaded), and wasn't able to reproduce the error,
but, once again, this problem can't be reproduced on demand.
I also wrote a little SystemTap script which directly calls unmask_IO_APIC_irq
with the SATA controller's IRQ number. If I run this script when I'm not getting
any interrupts from the SATA controller, I start getting interrupts again. This
suggests to me that the interrupt may be disabled at the IOAPIC level without
the kernel's knowledge.
I also wrote another SystemTap script which records stack traces everytime
unmask_IO_APIC_irq or mask_IO_APIC_irq are called in order to determine if the
IOAPIC is actually disabling the IRQ without the kernel's knowledge. However,
whenever I leave this script running, I've never been able to reproduce problem.
This suggests to me that their may be IOAPIC access timing issues involved.
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