Re: Intel P6 vs P7 system call performance

Ulrich Drepper (drepper@redhat.com)
Tue, 17 Dec 2002 17:54:38 -0800

Nakajima, Jun wrote:
> AMD (at least Athlon, as far as I know) supports sysenter/sysexit. We tested it on an Athlon box as well, and it worked fine. And sysenter/sysexit was better than int/iret too (about 40% faster) there.

That's good to know but not what I meant.

I referred to syscall/sysret opcodes. They are broken in their own way
(destroying ecx on kernel entry) but at least they preserve eip.

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