[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] RFC: large system support - 128 CPUs
On 13/8/08 09:45, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > But the cpumask-in-page_info is a scalability concern, too - systems with > many CPUs will tend to have a lot of memory, and the growing overhead > of the page_info array may become an issue then, too. Page clustering > may be an option to reduce/eliminate the growth, though I didn't spend > much thought on this or possible alternatives. An extra 8 bytes per page per 64 CPUs is hardly a concern I think. We're talking an overhead of 32 bytes per megabyte per CPU. The concern over growing page_info array with growing memory is fallacious -- the overhead is a constant fraction of total memory, if #CPUs is held constant. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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