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

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Date:	Wed, 12 Dec 2007 17:27:56 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	Romano Giannetti <romanol@...omillas.es>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFT] Port 0x80 I/O speed

On 12-12-07 10:57, Romano Giannetti wrote:

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

> cycles: out 3575, in 2844

Okay, I'm going to ignore this one. This would be 4 microsecs but there are 
sleep states involved, and if a piece of hardware would work only when the 
system went to sleep I'd call it broken...

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

> cycles: out 3446, in 2652

So this one will do I guess. The test program disables interrupts and as 
such, the cpu-hog shouldn't have interfered with the measurement. Thanks!

Rene.
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