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

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Date:	Wed, 12 Dec 2007 10:44:02 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	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

Jiri Slaby wrote:
> On Dec 12, 2007 9:48 AM, Jiri Slaby <jirislaby@...il.com> wrote:
>> On 12/12/2007 12:31 AM, Rene Herman wrote:
>>> Good day.
>>>
>>> Would some people on x86 (both 32 and 64) be kind enough to compile and
>>> run the attached program? This is about testing how long I/O port access
> 
> 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.

	-hpa
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