sysctl: dev.cpu.0.freq: Device busy (cpufreq p4tcc / RELENG_6)
Marcus Alves Grando
mnag at FreeBSD.org
Tue Feb 28 16:48:04 PST 2006
Well, works. Thanks. It's possible to printf some message about this if
kern.timecounter.hardware != ACPI-fast? Or add message in cpufreq(4)?
Thanks
Nate Lawson wrote:
> Marcus Alves Grando wrote:
>> I have problems in cpufreq in RELENG_6 (today).
>>
>> I try to set another frequency in my laptop and get this error:
>>
>> # sysctl dev.cpu.0.freq=250
>> dev.cpu.0.freq: 2000
>> sysctl: dev.cpu.0.freq: Device busy
>>
>> Timecounter "TSC" frequency 1995011972 Hz quality 800
>> Timecounters tick every 1.000 msec
>
> Try setting your timecounter to acpi or i8254 (not TSC):
>
> sysctl kern.timecounter.hardware="acpi"
>
> Without complicated recalibration code (which no one has written yet),
> we can't base our system time off the TSC counter when cpufreq is
> changing it.
>
--
Marcus Alves Grando
marcus(at)corp.grupos.com.br | Grupos Internet S/A
mnag(at)FreeBSD.org | FreeBSD.org
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