Re: [XenPPC] [PATCH/RFC] Schedule idle domain on secondary processors

[Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>]

> > > It is quite stable in that the secondary processors reliably join  
> > > the
> > > idle domain and wait for free pages to scrub, handling 0x980
> > > interrupts
> > > with no problem.
> > What's this 980 exception?
> Perhaps my phrasing is bad.  I was referring to the hypervisor
> decrementor interrupt (hdec).
Ah yes, I forgot, thanks.

> > > However, the domU's sometimes hang during initialization.  When the
> > > domU hangs, it seems the whole machine freezes, including the serial
> > > console.
> > Most common cause of this is hanging the U3/U4.  Do you have a
> > hardware debugger to see where this happens?
> I had a friend take a look at the state of cpu 0, but everything  
> seems ok.
> It looks like there is a race and occasionally one of the secondary
> processors is hanging the U4.
Doing a cacheable load/store to HT (or something else on U4)
perhaps?


Segher


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