Re: [PATCH 2/2][2.5]Unisys ES7000 platform subarch

[James Cleverdon]

On Wednesday 11 June 2003 08:56 am, Mika Penttilä wrote:
> Just out of curiosity, what are "Physical Cluster" and "Logical
> Cluster"?  This terminology doesn't appear in Intel documentation.
> AFAIK, IPIs are currently always sent using logical destination mode,
> and in your patch ioapic entries have logical mode in cluster case. So
> where does physical cluster  come into play?
>
> --Mika

Starting with P4s, Intel has enabled physical interrupts that correctly use 
the upper nibble of the destination field when clustered addressing mode is 
turned on.  Hence the name "Physical Cluster", even if it may not be official 
terminology.

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com