Re: Processor IDs on the Niagara

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From: Elad Lahav <elahav@xxxxxxxxxxxx>
Date: Fri, 12 Sep 2008 17:10:50 -0400

> I have a question regarding the meaning of cpu_data.proc_id.  My
> T1000 contains a single T1 processor, with 8 cores and 4 threads per
> core. The core_id value for each hardware thread is set up properly
> (though starting from 1 rather than 0). The proc_id value, however,
> does not make sense: it maps to core_id - 1.

This is the correct setting.

The kernel treats core_id==0 as special, therefore we start the
indexes there at "1".

The kernel treats proc_id=-1 as special, therefore we start those
indexes at "0".

This is why we initialize core_id=0 and prof_id=-1 before we are
able to figure out what the values should be.

This is what other ports do.
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