2012/12/13 Andi Kleen <andi@xxxxxxxxxxxxxx>: >> 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>