Re: [RFC] clustered apic irq affinity fix for i386

William Lee Irwin III (wli@holomorphy.com)
Wed, 30 Apr 2003 19:49:48 -0700

On Wed, Apr 30, 2003 at 07:22:05PM -0700, Andrew Morton wrote:
> Is it not possible to fix set_ioapic_affinity() for real for clustered APIC
> mode? What is involved in that?

The clustered hierarchical destination format formats destinations as

bits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
--------------------------------------
| cluster id no | local cpumask |
--------------------------------------

which can only describe 15*16 of the 2**60 nonempty subsets of 60 cpus.

-- wli
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