F14 cpuspeed / ondemand broken?

[Steven Haigh]

On 4/01/2011 12:08 AM, Adam Williamson wrote:
> On Fri, 2010-12-31 at 08:49 -0600, Richard Shaw wrote:
>
>> I wish I could find the site where I got this information as my
>> recollection of it is a bit hazy but part of your problem may be that
>> the p4-clockmod and ondemand are more or less incompatible. I remember
>> reading something on kerneltrap or something. Basically the latency of
>> changing frequencies are so bad with p4-clockmod that ondemand gives
>> up on it or something like that. I think I could force it to work on
>> my Celeron based EEEPC by manually setting the governor something like
>> this[1]:
>
> yeah, I recall p4-clockmod being called out as problematic in several
> ways by some kernel dev or other, but like you I can't recall the
> details :/
>
> on my system which wants to use p4-clockmod, I just blacklist it and run
> full steam ahead all the time.

What I don't understand is that if the CPU supports ACPI, the mainboard 
supports ACPI, why can't we throttle the CPU using ACPI?

 From /proc/cpuinfo:
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm 
constant_tsc pebs bts pni dtes64 monitor ds_cpl cid cx16 xtpr lahf_lm

-- 
Steven Haigh

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