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Message-ID: <3DFE2FBE.7080306@zytor.com>
Date: Mon, 16 Dec 2002 11:55:42 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
Organization: Zytor Communications
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To: Pavel Machek <pavel@ucw.cz>
CC: "Albert D. Cahalan" <acahalan@cs.uml.edu>, linux-kernel@vger.kernel.org,
       terje.eggestad@scali.com
Subject: Re: Intel P6 vs P7 system call performance
References: <20021215220132.GB6347@elf.ucw.cz> <200212160733.gBG7XhD67922@saturn.cs.uml.edu> <20021216111759.GA24196@atrey.karlin.mff.cuni.cz>
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Pavel Machek wrote:
> 
>>The vsyscall stuff costs you on every syscall. It's nice for
> 
> 
> Well, the cost is basically one call. That's not *that* big cost.
> 

You absolutely, positively *need* the call anyway.  SYSENTER trashes EIP.

	-hpa


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