Re: [Xen-devel] [PATCH] improve x86 page table handling performance

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> "Jan Beulich" <jbeulich@xxxxxxxxxx> 26.03.07 16:50 >>>
>Where possible,
>- use hypercalls instead of writing to read-only pages
>- fold TLB flushes into page table update hypercalls
>- on PAE, use single-access updates instead of two-access ones
>
>The single change to pte_clear() yields a 25-30% boost for kernel builds
>on a 4x2x2 CPUs, 8Gb box; the other changes together yield improvements
>of 2-5%.

I shall clarify that this is for the PAE case only (i.e. resulting from the
folding of two page faults into a single hypercall, which is being used in the
kmap path).

Jan

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