Messages in this thread | | | Date | Fri, 5 Jun 2009 07:54:43 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [benchmark] 1% performance overhead of paravirt_ops on native kernels |
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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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