On Fri, 14 Apr 2006, Luck, Tony wrote: > > We found that on motherboard latencies are typically 1 to 1.4 of local memory > > access speed whereas multinode systems which benefit from zone reclaim have > > usually more than 1.5 times the latency of a local access. > > > > Set the reclaim distance for IA64 to 1.5 times. > > Does this really apply just to ia64 systems? Or is the "20" value in > topology.h just wrong? The value in topology.h is the same as the REMOTE_DISTANCE. I think we better leave these as fallbacks for systems that do not implement node_distance(). > Is the right value for this any any way related to the "migration_cost" > that we spend many seconds of boot time computing? I am not familiar with that. Does the migration_cost take the SLIT node distances into consideration? - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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