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.
Jun
> -----Original Message-----
> From: Ulrich Drepper [mailto:drepper@redhat.com]
> Sent: Tuesday, December 17, 2002 11:19 AM
> To: Linus Torvalds
> Cc: Matti Aarnio; Hugh Dickins; Dave Jones; Ingo Molnar; linux-
> kernel@vger.kernel.org; hpa@transmeta.com
> Subject: Re: Intel P6 vs P7 system call performance
>
> Linus Torvalds wrote:
>
> > In the meantime, I do agree with you that the TLS approach should work
> > too, and might be better. It will allow all six arguments to be used if
> we
> > just find a good calling conventions
>
> If you push out the AT_* patch I'll hack the glibc bits (probably the
> TLS variant). Won't take too long, you'll get results this afternoon.
>
> What about AMD's instruction? Is it as flawed as sysenter? If not and
> %ebp is available I really should use the TLS method.
>
> --
> --------------. ,-. 444 Castro Street
> Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
> Red Hat `--' drepper at redhat.com `---------------------------
>
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