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    SubjectRE: Intel P6 vs P7 system call performance
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    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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