Messages in this thread | | | Date | Wed, 4 Sep 2002 09:45:21 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [patch] "fully HT-aware scheduler" support, 2.5.31-BK-curr |
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On Tue, 3 Sep 2002, Michael Hohnbaum wrote:
> > (NUMA systems which have tightly coupled CPUs with a smaller cache and > > protected by a large L3 cache might benefit from sharing the runqueue as > > well - but the target for this concept is SMT.) > > Sharing a runqueue for all processors on a node of a NUMA system has the > drawback of not accounting for cache warmth for processes. [...]
hence the 'might'.
> [...] Ideally, for a NUMA system there should continue to be individual > runqueues per cpu (or per set of HT processors), and then a grouping of > runqueues at the node level. At load balancing, priority should be to > redispatch on the same processor, followed by on the same node. The > pain threshold for crossing the node boundary will vary depending on the > NUMA-ness of the hardware, so it would be good to account for this in > the scheduler.
agreed.
Ingo
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