linux-kernel - Re: [RFT] Port 0x80 I/O speed

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Date:	Wed, 12 Dec 2007 13:35:21 +0100
From:	Paolo Ornati <ornati@...twebnet.it>
To:	linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, rene.herman@...il.com,
	linux@...izon.com
Subject: Re: [RFT] Port 0x80 I/O speed

On 12 Dec 2007 06:20:49 -0500
linux@...izon.com wrote:

> With -O2, the cycle counts come out (before division) as
> out: 0xFFFFFFFFFFEA6F4F
> in:  0xFFFFFFFFFCE68BB6
> I think the "A" constraint doesn't work quite the same in
> 64-bit code.  The compiler seems to be using %rdx rather than
> %edx:%eax.

In another message he says to compile it with "-m32"  :)

-- 
	Paolo Ornati
	Linux 2.6.24-rc5-g4af75653 on x86_64
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