Messages in this thread | | | Date | Tue, 17 Dec 2002 11:12:46 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Linus Torvalds wrote: > > It's not as good as a pure user-mode solution using tsc could be, but > we've seen the kinds of complexities that has with multi-CPU systems, and > they are so painful that I suspect the sysenter approach is a lot more > palatable even if it doesn't allow for the absolute best theoretical > numbers. >
The complexity only applies to nonsynchronized TSCs though, I would assume. I believe x86-64 uses a vsyscall using the TSC when it can provide synchronized TSCs, and if it can't it puts a normal system call inside the vsyscall in question.
-hpa
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