Messages in this thread | | | Date | Mon, 17 Dec 2012 22:58:42 +0900 | Subject | Re: [PATCH] mm: introduce numa_zero_pfn | From | JoonSoo Kim <> |
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2012/12/13 Andi Kleen <andi@firstfloor.org>: >> I would expect a processor to fetch the zero page cachelines from the l3 >> cache from other sockets avoiding memory transactions altogether. The zero >> page is likely in use somewhere so no typically no memory accesses should >> occur in a system. > > It depends on how effectively the workload uses the caches. If something > is a cache pig of the L3 cache, then even shareable cache lines may need > to be refetched regularly. > > But if your workloads spends a significant part of its time reading > from zero page read only data there is something wrong with the workload. > > I would do some data profiling first to really prove that is the case.
Okay. I didn't know about L3 cache, before. Now, I think that I need some data profiling! Thanks for comment.
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