RE: [Xen-devel] [PATCH] permute with 2MB chunk

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxxx>]

> We also tested building an HVM guest with the permuted ordering of
> pages, versus reverse ordering, versus normal ordering. Only the
permuted
> ordering showed the problem. We assume that the permute() function has
an
> unfortunate interaction with the memory allocator in certain HVM guest
OSes,
> causing poor cache utilisation.

It's still very odd that the permutation fn only seems to effect Linux
running as a HVM guest and not as a PV guest. I still think there's
something we're not quite understanding.

Jean: have you definitely verified that building a domain with the
permute function does not affect Linux PV guests?

Thanks,
Ian


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