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Message-ID: <3DFFD55E.6020305@redhat.com>
Date: Tue, 17 Dec 2002 17:54:38 -0800
From: Ulrich Drepper <drepper@redhat.com>
Organization: Red Hat, Inc.
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To: "Nakajima, Jun" <jun.nakajima@intel.com>
CC: Linus Torvalds <torvalds@transmeta.com>,
       Matti Aarnio <matti.aarnio@zmailer.org>,
       Hugh Dickins <hugh@veritas.com>, Dave Jones <davej@codemonkey.org.uk>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       hpa@transmeta.com
Subject: Re: Intel P6 vs P7 system call performance
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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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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------

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