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xen-ia64-devel
Re: [Xen-ia64-devel] RE: PATCH: dom_rid_bits command line parameter
Le Vendredi 14 Avril 2006 16:39, Magenheimer, Dan (HP Labs Fort Collins) a
écrit :
> I suggest changing the comment from "host rid space is shared
> among the domains" to "host rid space is partitioned among
> the domains".
Ok.
> Also it might be wise to complain/panic if
> dom_rid_bits is set > 22. If 23, only dom0 can run (no domUs).
This may be still useful.
Also note:
printf ("Maximum of simultaneous domains: %d\n",
(1 << (implemented_rid_bits - domain_rid_bits_default)) - 1);
> Perhaps also if dom_rid_bits is set at all, a descriptive
> message should be printed stating "dom_rid_bits is set to xx;
> each domain has yy rids".
Ok.
> 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;
Thank you for your comments,
Tristan.
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