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List:       linux-kernel
Subject:    Re: sched_domains + NUMA issue
From:       Jesse Barnes <jbarnes () sgi ! com>
Date:       2004-08-29 16:40:31
Message-ID: 200408290940.31903.jbarnes () sgi ! com
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On Sunday, August 29, 2004 4:18 am, Anton Blanchard wrote:
> Hi,
>
> We are seeing errors in the sched domains debug code when SMT + NUMA is
> enabled. Nathan pointed out that the recent change to limit the number
> of nodes in a scheduling group may be causing this - in particular
> sched_domain_node_span.
>
> It looks like ia64 are the only ones implementing a reasonable
> node_distance, the others just do:
>
> #define node_distance(from,to) (from != to)
>
> On these architectures I wonder if we should disable the
> sched_domain_node_span code since we will just get a random grouping of
> cpus.

Hmm... for now that's probably a good idea.  There's no CONFIG_NUMA_* value we 
could key off of to figure out if node_distance is sane, so it's probably our 
only option.

Jesse
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