Re: Intel P6 vs P7 system call performance

Alan Cox
2002-12-17T20:01:34Z

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