From: A L <mail@lechevalier.se>
To: linux-pm@vger.kernel.org
Subject: Schedutil scaling governor is missing time_in_state
Date: Sat, 11 Jul 2020 19:49:44 +0200 (GMT+02:00) [thread overview]
Message-ID: <6dfd665.397441d8.1733eff4aa2@lechevalier.se> (raw)
Hello,
I am testing the 'schedutil' scaling govenor.
So far it seems to give good results in terms of reduced thermals and energy consumption.
One difference compared to 'ondemand' that I noticed is that /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state is never updated. It is always empty. This creates a problem for my munin graphs that log the average CPU frequency for each core.
Example with 'ondemand'
cpu0/cpufreq/stats/time_in_state:3500000 3869872
cpu0/cpufreq/stats/time_in_state:2300000 581995
cpu0/cpufreq/stats/time_in_state:1600000 6895937
cpu0/cpufreq/stats/total_trans:1746213
cpu0/cpufreq/stats/trans_table: From : To
cpu0/cpufreq/stats/trans_table: : 3500000 2300000 1600000
cpu0/cpufreq/stats/trans_table: 3500000: 0 49335 62476
cpu0/cpufreq/stats/trans_table: 2300000: 58219 0 756854
cpu0/cpufreq/stats/trans_table: 1600000: 53591 765738 0
Example with 'schedutil'
cpu3/cpufreq/stats/time_in_state:<empty>
cpu3/cpufreq/stats/total_trans:1751092
cpu3/cpufreq/stats/trans_table:<empty>
Is this a known problem or perhaps a design choice?
This is on kernel 5.7.8 on and AMD Athlon 3000G CPU using 'acpi_cpufreq' scaling_driver.
Anders
next reply other threads:[~2020-07-11 17:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-11 17:49 A L [this message]
2020-09-03 11:02 ` Schedutil scaling governor is missing time_in_state Viresh Kumar
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