cpu frequency scaling
lang.gerhard at gmail.com
Wed Nov 11 13:35:00 GMT 2009
Tx, but now after reading this article
http://wiki.archlinux.org/index.php/Cpufrequtils I first went another
way and manipulated ondemand threshold,
I edited /etc/rc.local as follows:
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
# In order to enable or disable this script just change the execution
# By default this script does nothing.
echo 20 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold
cpu1 is linked to cpu0 on my amd system, if it were not I might have to
add a second line for cpu1.
By default 'cat
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold' showed 80
when running 2.6.31-9-rt. In 2.6.31-15-generic it's 95.
Setting up_threshold as recommended in these articles to 50 or 35 did
not do the job, had to lower it to 20.
Now qjackctl shows the same cpu-load and few xruns as when I set cpufreq
from ondemand to highest value. Next I will do is testing this on my
Notebook with intel dualcore.
Ricardo Lameiro schrieb:
> You could add cpufreq performance to one of the init steps... I think
> someone here can explain how to do that, but I think you can
> 2009/11/10 Gerhard Lang <lang.gerhard at gmail.com
> <mailto:lang.gerhard at gmail.com>>
> I always run into jackd low latency issues when I forget to set cpu
> frequency scaling panel-applets to highest options. Is there a way to
> set this by default on start up without recompiling the rt-kernel?
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