Re: Intel P6 vs P7 system call performance

From: H. Peter Anvin (hpa@transmeta.com)
Date: Tue Dec 17 2002 - 22:36:19 EST


Ulrich Drepper wrote:
>
> 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.
>

Destroying %ecx is a lot less destructive than destroying %eip and %esp...

        -hpa

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