Re: Intel P6 vs P7 system call performance

From: Ville Herva (
Date: Fri Dec 13 2002 - 10:58:59 EST

On Fri, Dec 13, 2002 at 10:21:11AM +0100, you [Terje Eggestad] wrote:
> Well, it does make sense if Intel optimized away rdtsc for more commonly
> used things, but even that don't seem to be the case. I'm measuring the
> overhead of doing a syscall on Linux (int 80) to be ~280 cycles on PIII,
> and Athlon, while it's 1600 cycles on P4.

Just out of interest, how much would sysenter (or syscall on amd) cost,
then? (Supposing it can be feasibly implemented.)

I think I heard WinXP (W2k too?) is using sysenter?

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