Re: [PATCH] SMM BIOS on Dell i8100

[Massimo Dal Zotto <dz@cs.unitn.it>]

> On Thu, Nov 08, 2001 at 07:14:03PM +0100, Massimo Dal Zotto wrote:
> > I have released version 1.4 of my package with a new kernel module and
> > some enhancements to the i8kmon utility.
> 
> hello,
> 
> [no patch today :-)]
> 
> here is what top gives me :
>   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
>  8102 kwisatz   15   0  2612 2612  1804 S     1.3  0.5   0:01 tclsh
>  1663 kwisatz   10   0  3172 2436  2028 S     0.1  0.4   0:25 gkrellm
> 
> It seems that gkrellm (which monitors more than 20 things on my laptop)
> takes only 0.1% of cpu, whereas i8kmon takes 1.3%...
> I have absolutely no idea how to improve that, but I think that should
> be the first thing on the TODO :-)
> 

Hi Stephane,

first question, why is your mailer using a charset=unknown-8bit instead
of the standard iso8859-1?

> Content-Type: text/plain; charset=unknown-8bit
> Content-Disposition: inline
> Content-Transfer-Encoding: quoted-printable

This gives an error in my editor elm and forces me to use cut-and-paste:

> [Charset unknown-8bit unsupported, skipping...]


Now back to i8kutils. No patch today because I was debugging exactly this
problem. I discovered that the SMM calls GET_CPU_TEMP and GET_POWER_STATUS
take a very long time compared to the other calls and this slows down the
whole program. Here is what I discovered:

    cpu_temp    = i8k_get_cpu_temp();			/* 11100 µs */
    left_fan    = i8k_get_fan_status(I8K_FAN_LEFT);	/*   580 µs */
    right_fan   = i8k_get_fan_status(I8K_FAN_RIGHT);	/*   580 µs */
    left_speed  = i8k_get_fan_speed(I8K_FAN_LEFT);	/*   580 µs */
    right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT);	/*   580 µs */
    ac_power    = i8k_get_power_status();		/* 14700 µs */
    fn_key      = i8k_get_fn_status();			/*   750 µs */

Since I can't fix the SMM BIOS I think there is very little I can do,
except avoiding the GET_POWER_STATUS call which uses half of the time.
I will try to get the same information from /proc/apm.

Did you try the latest version (1.4)? Does it work on your I8100?

-- 
Massimo Dal Zotto

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|  Massimo Dal Zotto               email: massimo.dalzotto@libero.it   |
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|  Italy                                  http://www.debian.org/~dz/   |
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