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

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Date:	Wed, 12 Dec 2007 10:57:19 +0100
From:	Romano Giannetti <romanol@...omillas.es>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFT] Port 0x80 I/O speed



On Wed, 2007-12-12 at 00:31 +0100, Rene Herman wrote:
> cc -W -Wall -O2 -o port80 port80.c

On a laptop with a CoreDuo T2080/1.73GHz, but running on battery at 
800 MHz (on-demand):

(0)rukbat:~/tmp% for i in {1..10}; do
sudo ./port80
done
cycles: out 3575, in 2844
cycles: out 3589, in 2923
cycles: out 3672, in 2864
cycles: out 3575, in 2843
cycles: out 3607, in 2859
cycles: out 3623, in 2877
cycles: out 3604, in 2848
cycles: out 3575, in 2849
cycles: out 3598, in 2861
cycles: out 3613, in 2861

With a cpu-hog running, cpufreq reporting 1.73GHz:

 
(0)rukbat:~/tmp% for i in {1..10}; do
sudo ./port80
done
cycles: out 3446, in 2652
cycles: out 3499, in 2668
cycles: out 3395, in 2578
cycles: out 3452, in 2662
cycles: out 3448, in 2662
cycles: out 3622, in 2754
cycles: out 3457, in 2662
cycles: out 3451, in 2660
cycles: out 3581, in 2850
cycles: out 3477, in 2696

HTH,
	Romano 

Romano 

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