On 05/03/2013 12:36 PM, Rafael J. Wysocki wrote:
On Friday, May 03, 2013 06:55:37 PM Toralf Förster wrote:
The following file doesn't exists at my Gentoo Linux
/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
in 3.9.0 if I activate CONFIG_X86_INTEL_PSTATE=y
That means, that a command like
$> echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
in /etc/rc.local is now no longer working.
A high fan + high temperature are the result, even if just the BOINC client
is run with low prio (nice 19) in the back ground.
ignore_nice_load is a feature of the ondemand governor.
The intel_pstate driver is seeing the load presented by the BOINC client and
is adjusting the pstate accordingly.
Manually loading the missing module won't work too :
$> modprobe acpi_cpufreq
modprobe: ERROR: could not insert 'acpi_cpufreq': Device or resource busy
Is the behaviour a bug or a feature ?
The intel_pstate drive has already registered as a scaling driver so when
acpi_cpufreq tries to register as a scaling driver the registration fails
The thermal management problem is not an intentional outcome, definitely.
In the later case: How can I achieve the previous behaviour back ?
If you require the ondemand governor you can remove CONFIG_X86_INTEL_PSTATE
from your configuration or add "intel_pstate=disable" to your kernel command
line.
--Dirk
This issue might affect the RH EL kernel too [1] where I observed a similar behaviour.
[1] http://elrepo.org/bugs/view.php?id=379
Dirk, is this the problem we were talking about recently or something else?
Rafael
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