RE: [Xen-ia64-devel] RE: PATCH: dom_rid_bits command line parameter

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

> > Should dom_rid_bits < 18 be allowed?  Architecturally the
> > answer is no, but if all guests support it, a system adminstrator
> > might choose to make the tradeoff (worse performance in each
> > domain for more concurrent domains).
> It is useless to allow it unless you redefine 
> IA64_MIN_IMPL_RID_BITS.  This is 
> due to:
> 
> if (ridbits < IA64_MIN_IMPL_RID_BITS)
>               ridbits = IA64_MIN_IMPL_RID_BITS;

That's exactly what I was suggesting.  A paravirtualized
Linux/ia64 might reasonably expect IA64_MIN_IMPL_RID_BITS
to be less than the architectural minimum so that the
rid space can be partitioned differently.

Dan

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