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xen-devel
[Xen-devel] Re: [PATCH] xen: core dom0 support
Anthony Liguori wrote:
Jeremy Fitzhardinge wrote:
Nick Piggin wrote:
It really depends on the workload. There's three cases to consider:
software shadow pagetables, hardware nested pagetables, and Xen
direct pagetables. Even now, Xen's (highly optimised) shadow
pagetable code generally out-performs modern nested pagetables, at
least when running Windows (for which that code was most heavily tuned).
Can you point to benchmarks? I have a hard time believing this.
Erm, not that I know of off-hand. I don't really have any interest in
Windows performance, so I'm reduced to repeating (highly reliable) Xen
Summit corridor chat.
How can shadow paging beat nested paging assuming the presence of
large pages?
I think large pages do turn the tables, and its close to parity with
shadow with 4k pages on recent cpus. But see above for reliability on
that info.
J
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