Scaling governor via sysctl?
Todd A. Jacobs
echoing a value to:
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
However, I'm not finding a key for it via the sysctl utility. When I
run:
sysctl -a | fgrep -i cpu
I get nothing. Why can I write to a value in sysfs that can't be
accessed with sysctl? And more importantly, how am I supposed to do this
at boot without sysctl.conf?
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Todd A. Jacobs
> I get nothing. Why can I write to a value in sysfs that can't be
> accessed with sysctl? And more importantly, how am I supposed to do this
> at boot without sysctl.conf?
Two quick answers, but a remaining question. The default governor
can be set in /etc/default/cpufrequtils, and can be changed with:
sudo cpufreq-set -g ondemand
which probably just does the same thing as echoing to the right key in
sysfs.
However, I still don't understand why I can't set it with sysctl. What's
up with that?
Tilo Schwarz
wrote:
> I'd like to set my scaling governor in /etc/sysctl.conf, rather than by
> echoing a value to:
>
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>
> However, I'm not finding a key for it via the sysctl utility. When I
> run:
>
> sysctl -a | fgrep -i cpu
>
> I get nothing. Why can I write to a value in sysfs that can't be
> accessed with sysctl? And more importantly, how am I supposed to do this
> at boot without sysctl.conf?
>
I use sysfs.conf:
#grep demand /etc/sysfs.conf
devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
--
Regards,
Tilo
Carl Johnson
> On Thu, 28 Jan 2010 05:42:13 +0100, Todd A. Jacobs
> <nos...@codegnome.org> wrote:
>
>> I'd like to set my scaling governor in /etc/sysctl.conf, rather than by
>> echoing a value to:
>>
>> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>
>> However, I'm not finding a key for it via the sysctl utility. When I
>> run:
>>
>> sysctl -a | fgrep -i cpu
>>
>> I get nothing. Why can I write to a value in sysfs that can't be
>> accessed with sysctl? And more importantly, how am I supposed to do this
>> at boot without sysctl.conf?
>>
>
> I use sysfs.conf:
>
> #grep demand /etc/sysfs.conf
> devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
If you have the cpufrequtils package installed, then just edit
/etc/defaults/cpufrequtils to specify which you want at boot.
--
Carl Johnson ca...@peak.org
Todd A. Jacobs
> If you have the cpufrequtils package installed, then just edit
> /etc/defaults/cpufrequtils to specify which you want at boot.
The /etc/defaults/cpufrequtils file over-rides the value (if any) in
/etc/sysfs.conf, but I think it's important to know that values can be
set there, too.
Thanks for the help.
--
"Oh, look: rocks!"
-- Doctor Who, "Destiny of the Daleks"
Todd A. Jacobs
> I use sysfs.conf:
Thanks. I knew about sysctl.conf, but not sysfs.conf. I appreciate you
pointing that out!
--
"Oh, look: rocks!"
-- Doctor Who, "Destiny of the Daleks"
Tilo Schwarz
> "Tilo Schwarz" <ti...@tilo-schwarz.de> writes:
>
>> On Thu, 28 Jan 2010 05:42:13 +0100, Todd A. Jacobs
>> <nos...@codegnome.org> wrote:
>>
>>> I'd like to set my scaling governor in /etc/sysctl.conf, rather than by
>>> echoing a value to:
>>>
>>> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>>
>>> However, I'm not finding a key for it via the sysctl utility. When I
>>> run:
>>>
>>> sysctl -a | fgrep -i cpu
>>>
>>> I get nothing. Why can I write to a value in sysfs that can't be
>>> accessed with sysctl? And more importantly, how am I supposed to do
>>> this
>>> at boot without sysctl.conf?
>>>
>>
>> I use sysfs.conf:
>>
>> #grep demand /etc/sysfs.conf
>> devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
>
> If you have the cpufrequtils package installed, then just edit
> /etc/defaults/cpufrequtils to specify which you want at boot.
I don't have the cpufrequtils package installed.
--
Regards,
Tilo
Carl Johnson
> On Fri, 29 Jan 2010 23:26:40 +0100, Carl Johnson <ca...@peak.org> wrote:
>
>> "Tilo Schwarz" <ti...@tilo-schwarz.de> writes:
>>
>>> On Thu, 28 Jan 2010 05:42:13 +0100, Todd A. Jacobs
>>> <nos...@codegnome.org> wrote:
>>>
>>>> I'd like to set my scaling governor in /etc/sysctl.conf, rather than by
>>>> echoing a value to:
>>>>
>>>> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>>>
>>>> However, I'm not finding a key for it via the sysctl utility. When I
>>>> run:
>>>>
>>>> sysctl -a | fgrep -i cpu
>>>>
>>>> I get nothing. Why can I write to a value in sysfs that can't be
>>>> accessed with sysctl? And more importantly, how am I supposed to
>>>> do this
>>>> at boot without sysctl.conf?
>>>>
>>>
>>> I use sysfs.conf:
>>>
>>> #grep demand /etc/sysfs.conf
>>> devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
>>
>> If you have the cpufrequtils package installed, then just edit
>> /etc/defaults/cpufrequtils to specify which you want at boot.
>
> I don't have the cpufrequtils package installed.
The cpufrequtils package adds programs which directly set
(cpufreq-set) and check (cpufreq-info) the frequency and drivers, so
you don't need to use the /sys filesystem manually.
--
Carl Johnson ca...@peak.org