8.1-RC2 - PCI fatal error or MCE triggered by USB/ehci on Sun X4100M2?

[Markus Gebert]

On 12.07.2010, at 17:40, Jeremy Chadwick wrote:

> cx_supported indicates your CPU only supports C1 and not lower
> power-saving states (C2/C3/C4, etc.).  Non-C1 states can sometimes do
> "interesting" things when it comes to interrupt handling.  I believe
> your system may support the C1E state (given what machdep.idle_available
> shows), but that's often controlled by the system BIOS (on both Intel
> and AMD processors, but I'm trying to focus on AMD here).  C1E, as far
> as I know, is the same as C1 state except can save a little bit more
> power.
> 
> I believe neither C1 nor C1E do anything with interrupts, instead just
> halting the core when idle/not in use.  HLT mode, at least on multi-core
> AMD CPUs, equates to C1E.

I see.

> Shot in the dark: you're not running powerd(8) on this system are you?

No, I'm not. But once in our long series of trial&error, I tried to enabled it, just to see wether it would trigger something. It didn't, but the system was not loaded at that time.

But I just remebered that I once tried to reproduce the problem with kern.smp.disabled=1 in loader.conf, but with the test load running only on the BSP, the problem did not seem to occur. Don't know if this is any of any help though.


Markus