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Subject: RE: Intel P6 vs P7 system call performance
Date: Tue, 17 Dec 2002 17:30:59 -0800
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Thread-Topic: Intel P6 vs P7 system call performance
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From: "Nakajima, Jun" <jun.nakajima@intel.com>
To: "Ulrich Drepper" <drepper@redhat.com>,
       "Linus Torvalds" <torvalds@transmeta.com>
Cc: "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>
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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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