Messages in this thread | | | Date | Tue, 6 Mar 2007 15:16:07 +1100 | From | Paul Mackerras <> | Subject | Re: The performance and behaviour of the anti-fragmentation related patches |
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Linus Torvalds writes:
> The point being that in the guests, hotunplug is almost useless (for > bigger ranges), and we're much better off just telling the virtualization > hosts on a per-page level whether we care about a page or not, than to > worry about fragmentation.
We don't have that luxury on IBM System p machines, where the hypervisor manages memory in much larger units than a page. Typically the size of memory block that the hypervisor uses to manage memory is 16MB or more -- which makes sense from the point of view that if the hypervisor had to manage individual pages, it would end up adding a lot more overhead than it does.
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