From: Jesse Barnes <jbarnes@sgi.com>
To: Anton Blanchard <anton@samba.org>
Cc: linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au,
nathanl@austin.ibm.com
Subject: Re: sched_domains + NUMA issue
Date: Sun, 29 Aug 2004 09:40:31 -0700 [thread overview]
Message-ID: <200408290940.31903.jbarnes@sgi.com> (raw)
In-Reply-To: <20040829111855.GB26072@krispykreme>
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
next prev parent reply other threads:[~2004-08-29 16:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-29 11:18 sched_domains + NUMA issue Anton Blanchard
2004-08-29 16:40 ` Jesse Barnes [this message]
2004-08-29 16:48 ` William Lee Irwin III
2004-08-30 21:34 ` NUMA for abstract bus-masters (was Re: sched_domains + NUMA issue) Guennadi Liakhovetski
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