Messages in this thread | | | Date | Sat, 27 Sep 2008 22:02:14 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] - UV fix for size of hub mappings |
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* Jack Steiner <steiner@sgi.com> wrote:
> > x2apic support is available in tip/master, so it would be nice to > > glue UV to generic x2apic support properly and remove duplication > > and fixmes. > > Good point. I'll send the fixes to you early next week. Recently, I've > been focused on a distro release which is still waiting for the x2apic > code. However, I don't need to wait to fix this upstream...
great!
> > For example, do we really need apic_x2apic_uv_x, or could we use > > apic_x2apic_cluster? > > Unfortunately, we really need a uv genapic. IPIs on large UV systems > can't use an x2apic model. Because of the size of our large systems, > APICIDs in the cpu MSRs are not globally unique. We have a special > feature in the UV chipset that must be used for on large systems for > IPIs. Small & medium sized system can and do use the x2apic genapic.
not a problem really - it's not really complex or intrusive, we just want to make sure all unnecessary duplication is eliminated.
Ingo
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