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

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Date:	Wed, 12 Dec 2007 15:30:44 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	Juergen Beisert <juergen127@...uzholzen.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [RFT] Port 0x80 I/O speed

On 12-12-07 09:59, Juergen Beisert wrote:

> $ for i in `seq 5`; do ./port80; sleep 1; done
> cycles: out 5260, in 2372
> cycles: out 5260, in 2384
> cycles: out 5260, in 2323
> cycles: out 5270, in 2382
> cycles: out 5259, in 2323
> 
> $ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 7
> model name      : Pentium III (Katmai)
> stepping        : 3
> cpu MHz         : 501.208

This one's really wrong. This would be 10 microsecs. I suppose the 
machine/bus was heavily loaded or something?

> $ for i in `seq 5`; do ./port80; sleep 1; done
> cycles: out 1214, in 1095
> cycles: out 1215, in 1094
> cycles: out 1214, in 1095
> cycles: out 1216, in 1095
> cycles: out 1213, in 1093
> 
> $ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 11
> model name      : Intel(R) Celeron(TM) CPU                1000MHz

This one's normal again...

Rene.
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