Message-ID: <47602BF2.9030602@zytor.com>
Date: Wed, 12 Dec 2007 10:44:02 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Jiri Slaby <jirislaby@gmail.com>
CC: Rene Herman <rene.herman@gmail.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>, dpreed@reed.com,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, pavel@ucw.cz, andi@firstfloor.org,
       rol@as2917.net, Krzysztof Halasa <khc@pm.waw.pl>, david@davidnewall.com,
       john@stoffel.org, linux-os@analogic.com
Subject: Re: [RFT] Port 0x80 I/O speed
References: <475F1DC6.5090403@keyaccess.nl> <475FA060.6070004@gmail.com> <4af2d03a0712120325n50d057baq7ec440c5e57fda39@mail.gmail.com>
In-Reply-To: <4af2d03a0712120325n50d057baq7ec440c5e57fda39@mail.gmail.com>
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Jiri Slaby wrote:
> On Dec 12, 2007 9:48 AM, Jiri Slaby <jirislaby@gmail.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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