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> William Lee Irwin III wrote: > > > > ... > > A 16KB or 64KB kernel allocation unit would then annihilate > On Fri, Dec 06, 2002 at 04:01:24PM -0800, Andrew Morton wrote: > You want to be careful about this: > CPU: L1 I cache: 16K, L1 D cache: 16K > Because instantiating a 16k page into user pagetables in > one hit means that it must all be zeroed. With these large > pagesizes that means that the application is likely to get > 100% L1 misses against the new page, whereas it currently > gets 100% hits. 16K is reasonable; after that one might as well go all the way. About the only way to cope is amortizing it by cacheing zeroed pages, and that has other downsides. Bill - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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