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Re: PAE and balloon benchmarks

On Mon, Jul 12, 2010 at 06:09:41PM +0300, Antti Kantee wrote:
> * Is the cost expected?  Naiively thinking, 15-20% seems quite high.

It sure does.  Isn't the amd64 MMU, for example, always 3-level in
approximately the same way?  And, architecturally, almost all the
current-production processors implementing PAE are 64-bit capable,
which means the 64-bit atomic ops should be no costlier on the underlying
execution resources than they are in native 64-bit mode -- or so I would
expect, anyway.

Is AMD64 this much slower than non-PAE IA32 too?

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