[Wiltshire] Linux 2.6.28, ondemand governor and nice 19 processes

[Richard Reynolds]

Sorry skim reading, the option you need from google is
CPU_FREQ_GOV_ONDEMAND but as you say it sounds like it's working but
ignoring the nice setting......hummm

Have you considered using the usermode setting to force the speed
down? Not really what your after but a temporary solution maybe.

2009/2/22 Robert <RobertCL at iname.com>:
> It's my own kernel, not the Gentoo one.  Any idea what settings I should
> be checking?
>
> Ondemand is working, because it switches between 1.6Ghz and 2.4Ghz
> depending on whats running.  The problem is that even de-niced processes
> cause it to step up to 2.4Ghz.
>
> I don't have cpufreq-info, but according to the files in /sys/.... I
> have ondemand selected and ignore_nice_load is set to 1 for all cores...
>
> Robert.
>
> Richard Reynolds wrote:
>> BTW whats does your cpufreq-info say?
>>
>> Can you set limits still with cpufreq-set?
>>
>> 2009/2/22 Richard Reynolds <richard at uberpussy.net>:
>>> Have you rolled your own kernel or used a Gentoo one? It could be that
>>> the default options have changed. Fire up your kernel config and check
>>> the settings, sounds like it isn't kicking in at all.
>>>
>>> It may also be the case that your CPU is an unlucky one this update as
>>> there are various instances where the governor code doesn't work due
>>> to CPUs own governors etc. It may well be fixed in the next
>>> incarnation
>>>
>>> 2009/2/22 Robert <RobertCL at iname.com>:
>>>> Hello,
>>>>
>>>> I'm hoping someone will be able to help with a problem I've been
>>>> experiencing ever since I upgraded to 2.6.28
>>>>
>>>> I run Boinc (seti at home, etc) as a background process on my quad core
>>>> server at a nice level of 19 and I'm using the ondemand CPU governor.
>>>>
>>>> Before upgrading to 2.6.28 processes running at nice 19 didn't cause the
>>>> CPU frequency to step up, so it ran at it's lowest clock speed, which
>>>> was perfect because it "saved" power and kept temperatures down.
>>>>
>>>> Since upgrading to 2.6.28, however it seems that this is not the case.
>>>> So running Boinc causes all my CPU's to run at full clock speed all of
>>>> the time, which I don't want - not only because it generates more heat
>>>> and uses more power, but it also seems to interfere with processes
>>>> running at higher nice levels, which I never really had a problem with
>>>> before.
>>>>
>>>> I've tried everything I can think of to get back to the previous
>>>> behaviour, but I'm at a bit of a loss what to search for or where to ask
>>>> about this!  Some (useful?) output below.
>>>>
>>>> As a workaround, I've currently limited the CPU time in the Boinc
>>>> manager to only use 50% of the available CPU's which means that 2 cores
>>>> run at 2.4GHz and two run at 1.6GHz, but this doesn't seem to be the
>>>> right solution and still causes the box to run hotter than if both idle
>>>> at 1.6GHz all the time
>>>>
>>>> Any suggestions appreciated!
>>>> Robert.
>>>>
>>>>
>>>> robert at quad ~ $ cat /proc/version
>>>> Linux version 2.6.28.4 (root at quad) (gcc version 4.1.2 (Gentoo 4.1.2
>>>> p1.1)) #6 SMP PREEMPT Sun Feb 8 12:42:20 GMT 2009
>>>>
>>>> robert at quad ~ $ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor
>>>> ondemand
>>>> ondemand
>>>> ondemand
>>>> ondemand
>>>>
>>>> robert at quad ~ $ cat
>>>> /sys/devices/system/cpu/cpu?/cpufreq/ondemand/ignore_nice_load
>>>> 1
>>>> 1
>>>> 1
>>>> 1
>>>>
>>>> robert at quad ~ $ cat /proc/cpuinfo |grep MHz
>>>> cpu MHz         : 1600.000
>>>> cpu MHz         : 2400.000
>>>> cpu MHz         : 1600.000
>>>> cpu MHz         : 2400.000
>>>>
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>>
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