Andi Kleen wrote: >> Im running it on a x86_64 box as we speak. How can I tell if there is a >> certain mode that is permitting this? >> > > If the boot up says you're running with PMtimer then it uses the fallback > (usually happens on pre Fam10h AMD boxes). A typical Intel box > would use the faster ring 3 only TSC path and then explode with your > change I bet. > Thinking about this some more, perhaps the issue is I am not hitting the contended path in vsyscall? -Greg
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