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

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Date:	Wed, 12 Dec 2007 20:19:19 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Jiri Slaby <jirislaby@...il.com>,
	Rene Herman <rene.herman@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, dpreed@...d.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>, pavel@....cz,
	andi@...stfloor.org, rol@...917.net,
	Krzysztof Halasa <khc@...waw.pl>, david@...idnewall.com,
	john@...ffel.org, linux-os@...logic.com
Subject: Re: [RFT] Port 0x80 I/O speed

On 12-12-07 19:44, H. Peter Anvin wrote:

>> model name      : Intel(R) Xeon(R) CPU           E5335  @ 2.00GHz 
>> cycles: out 3217, in 1898
> 
> 1.6 µs, on the high end....
> 
>> model name      : Dual Core AMD Opteron(tm) Processor 275
>> cycles: out 5508, in 5524
> 
> Definitely an outlier; 2.5 µs here.

Jah, I don't trust that one. Just posted the complete results:

http://lkml.org/lkml/2007/12/12/309

Rene.
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