Re: speedstep-smi woes

[Ducrot Bruno <ducrot@poupinou.org>]

On Tue, Nov 18, 2003 at 07:20:46PM +0100, Dominik Brodowski wrote:
> Under heavy load speedstep-smi generates "cpufreq: change failed" messages
> at least on two systems, one of them my own. I've tried to evaluate how to
> avoid these failures:
> 
> - wbinvd() has no positive effect
> - disabling bus master arbitration (io-port 0x22 on 440bx) has no positive effect
> - mdelay(250) immediately before the asm smi call has resulted in _zero_
>   failures.
> 
> However, in most cases, even under heavy load, the speedstep-smi driver
> _does_ achieve speedstep transitions. 
> 
> So, how to proceed?
> a) Try to avoid these failures, even if the cost of all transitions is 250ms
>    then? This practically disables dynamic frequency scaling for
>    speedstep-smi.
> b) Do the same as before: this means that sometimes the frequency isn't
>    changed even though the user or the dynamic frequency scaling governor
>    demands a higher frequency. Also, the "speedstep_init" step tends to fail
>    sometimes.
> 

Have you done testing with ide stuff in pio mode?

Cheers,

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.