Messages in this thread |  | | | Date | Tue, 17 Dec 2002 12:12:16 -0800 | | From | "H. Peter Anvin" <> | | Subject | Re: Intel P6 vs P7 system call performance |
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Alan Cox wrote: > On Tue, 2002-12-17 at 19:12, H. Peter Anvin wrote: > >>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. > > > For x86-64 there is the hpet timer, which is a lot saner but I don't > think we can mmap it >
It's only necessary, though, when TSC isn't usable. TSC is psycho fast when it's available. Just about anything is saner than the old 8042 or whatever it is called timer chip, though...
-hpa
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