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RE: [Xen-ia64-devel] RE: PATCH: dom_rid_bits command line parameter
| To: | "Tristan Gingold" <Tristan.Gingold@xxxxxxxx>, <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>, "Williamson, Alex (Linux Kernel Dev)" <alex.williamson@xxxxxx> |
|---|---|
| Subject: | RE: [Xen-ia64-devel] RE: PATCH: dom_rid_bits command line parameter |
| From: | "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx> |
| Date: | Mon, 17 Apr 2006 13:52:33 -0700 |
| Delivery-date: | Mon, 17 Apr 2006 13:53:17 -0700 |
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| Thread-index: | AcZf06m2CR2TlficQUC8E+qdI5tf9wCjLrtA |
| Thread-topic: | [Xen-ia64-devel] RE: PATCH: dom_rid_bits command line parameter |
> > 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 _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel |
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