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SubjectRe: [benchmark] 1% performance overhead of paravirt_ops on native kernels


On Fri, 5 Jun 2009, Rusty Russell wrote:
>
> Distributions don't ship UP kernels any more; this shows what that costs if
> you're actually on a UP box. If we really don't care, perhaps we should make
> CONFIG_SMP=n an option under EMBEDDED for x86. And we can rip out the complex
> patching SMP patching stuff too.

The complex SMP patching is what makes it _possible_ to not ship UP
kernels any more.

The SMP overhead exists, but it would be even higher if we didn't patch
things to remove the "lock" prefix.

Linus


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