RE: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> What is clear though is that you also depend on the memory 
> distribution
> across the (physical) address space: Contiguous (apart from the below-
> 4G hole) memory will likely represent little problems, but 
> sparse memory
> crossing the 44-bit boundary can't work in any case (since MFNs are
> represented as 32-bit quantities in 32-bit Dom0).

Urk.  Yes, I had forgotten about the sparse problem.

> I can't say there are known problems, but I'm convinced not everything
> can work properly above the boundary of 168G. Nevertheless it is quite
> possible that most or all of the normal (not error handling) 
> code paths
> work well. Page table walks e.g. during exceptions or kexec would be
> problem candidates. And while my knowledge of the tools is rather
> limited, libxc also has - iirc - several hard coded 
> assumptions that might not hold.

What is special about 168GB?  Or is that a typo?  (And if it
is supposed to be 128GB, what is special about 128GB?)

Thanks,
Dan


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