Hi,
I’ve been using tuned to set CPU speed for a few weeks. I started using it on Fedora 40 Workstation and everything worked as expected. Goal: low latency for audio.
However on dec 5, something happened and it stopped setting it like I wanted.
Yesterday, I upgraded to F41 and noticed that fact. So it’s not a F41 issue, it’s a tuned issue or something else causing it.
2024-12-13 08:19:41,775 INFO tuned.daemon.application: TuneD: 2.24.1, kernel: 6.6.64-200.fc41.x86_64
2024-12-13 08:19:41,776 INFO tuned.daemon.application: dynamic tuning is globally disabled
2024-12-13 08:19:41,787 INFO tuned.daemon.daemon: using sleep interval of 1 second(s)
2024-12-13 08:19:41,789 INFO tuned.profiles.loader: loading profile: latency-performance
2024-12-13 08:19:41,793 INFO tuned.daemon.controller: starting controller
2024-12-13 08:19:41,793 INFO tuned.daemon.daemon: starting tuning
2024-12-13 08:19:41,800 INFO tuned.plugins.base: instance cpu: assigning devices cpu2, cpu1, cpu3, cpu0
2024-12-13 08:19:41,801 INFO tuned.plugins.plugin_cpu: We are running on an x86 AuthenticAMD platform
2024-12-13 08:19:41,804 WARNING tuned.plugins.base: instance video: no matching devices available
2024-12-13 08:19:41,806 INFO tuned.plugins.plugin_cpu: setting governor 'performance' on cpu 'cpu2'
2024-12-13 08:19:41,815 INFO tuned.plugins.plugin_cpu: setting governor 'performance' on cpu 'cpu1'
2024-12-13 08:19:41,821 INFO tuned.plugins.plugin_cpu: setting governor 'performance' on cpu 'cpu3'
2024-12-13 08:19:41,831 INFO tuned.plugins.plugin_cpu: setting governor 'performance' on cpu 'cpu0'
2024-12-13 08:19:41,839 INFO tuned.plugins.plugin_cpu: setting new cpu latency 3
2024-12-13 08:19:41,840 INFO tuned.plugins.plugin_sysctl: reapplying system sysctl
2024-12-13 08:19:41,840 INFO tuned.daemon.daemon: static tuning from profile 'latency-performance' applied
2024-12-13 08:19:50,658 INFO tuned.daemon.daemon: stopping tuning
2024-12-13 08:19:50,659 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu2'
2024-12-13 08:19:50,659 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu1'
2024-12-13 08:19:50,659 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu3'
2024-12-13 08:19:50,659 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu0'
2024-12-13 08:19:50,660 INFO tuned.profiles.loader: loading profile: balanced
2024-12-13 08:19:50,661 INFO tuned.daemon.daemon: starting tuning
2024-12-13 08:19:50,707 INFO tuned.daemon.daemon: stopping tuning
2024-12-13 08:19:50,712 INFO tuned.plugins.base: instance audio: assigning devices snd_hda_intel
2024-12-13 08:19:50,713 WARNING tuned.plugins.base: instance video: no matching devices available
2024-12-13 08:19:50,757 INFO tuned.plugins.base: instance disk: assigning devices sda, loop9, loop14, loop6, loop12, loop5, loop15, loop7, loop13, dm-0, loop0, sdb, loop11, loop4, loop2, sdc, loop1, loop8, zram0, loop10, loop3
2024-12-13 08:19:50,773 INFO tuned.plugins.base: instance scsi_host: assigning devices host5, host4, host2, host0, host1, host3
2024-12-13 08:19:50,774 INFO tuned.plugins.base: instance cpu: assigning devices cpu2, cpu1, cpu3, cpu0
2024-12-13 08:19:50,775 INFO tuned.plugins.plugin_cpu: We are running on an x86 AuthenticAMD platform
2024-12-13 08:19:50,791 ERROR tuned.utils.commands: Executing 'modprobe -r cpufreq_conservative' error: modprobe: FATAL: Module cpufreq_conservative is builtin.
2024-12-13 08:19:50,795 INFO tuned.plugins.plugin_scsi_host: ALPM control file ('/sys/class/scsi_host/host5/link_power_management_policy') not found, skipping ALPM setting for 'host5'
2024-12-13 08:19:50,795 INFO tuned.plugins.plugin_scsi_host: ALPM control file ('/sys/class/scsi_host/host4/link_power_management_policy') not found, skipping ALPM setting for 'host4'
2024-12-13 08:19:50,796 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu2'
2024-12-13 08:19:50,802 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu1'
2024-12-13 08:19:50,808 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu3'
2024-12-13 08:19:50,812 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu0'
2024-12-13 08:19:50,819 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu2'
2024-12-13 08:19:50,819 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu1'
2024-12-13 08:19:50,819 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu3'
2024-12-13 08:19:50,819 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu0'
2024-12-13 08:19:50,820 INFO tuned.daemon.daemon: static tuning from profile 'balanced' applied
2024-12-13 08:19:50,821 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu2'
2024-12-13 08:19:50,821 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu1'
2024-12-13 08:19:50,821 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu3'
2024-12-13 08:19:50,821 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu0'
2024-12-13 08:19:50,822 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu2'
2024-12-13 08:19:50,826 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu1'
2024-12-13 08:19:50,830 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu3'
2024-12-13 08:19:50,837 INFO tuned.plugins.plugin_cpu: setting governor 'schedutil' on cpu 'cpu0'
2024-12-13 08:19:50,845 INFO tuned.profiles.loader: loading profile: balanced
2024-12-13 08:19:50,846 INFO tuned.daemon.daemon: starting tuning
2024-12-13 08:19:50,848 INFO tuned.plugins.base: instance audio: assigning devices snd_hda_intel
2024-12-13 08:19:50,849 WARNING tuned.plugins.base: instance video: no matching devices available
2024-12-13 08:19:50,860 INFO tuned.plugins.base: instance disk: assigning devices sda, loop9, loop14, loop6, loop12, loop5, loop15, loop7, loop13, dm-0, loop0, sdb, loop11, loop4, loop2, sdc, loop1, loop8, zram0, loop10, loop3
2024-12-13 08:19:50,864 INFO tuned.plugins.base: instance scsi_host: assigning devices host5, host4, host2, host0, host1, host3
2024-12-13 08:19:50,865 INFO tuned.plugins.base: instance cpu: assigning devices cpu2, cpu1, cpu3, cpu0
2024-12-13 08:19:50,866 INFO tuned.plugins.plugin_cpu: We are running on an x86 AuthenticAMD platform
2024-12-13 08:19:50,876 ERROR tuned.utils.commands: Executing 'modprobe -r cpufreq_conservative' error: modprobe: FATAL: Module cpufreq_conservative is builtin.
2024-12-13 08:19:50,881 INFO tuned.plugins.plugin_scsi_host: ALPM control file ('/sys/class/scsi_host/host5/link_power_management_policy') not found, skipping ALPM setting for 'host5'
2024-12-13 08:19:50,881 INFO tuned.plugins.plugin_scsi_host: ALPM control file ('/sys/class/scsi_host/host4/link_power_management_policy') not found, skipping ALPM setting for 'host4'
2024-12-13 08:19:50,882 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu2'
2024-12-13 08:19:50,887 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu1'
2024-12-13 08:19:50,892 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu3'
2024-12-13 08:19:50,899 INFO tuned.plugins.plugin_cpu: setting governor 'conservative' on cpu 'cpu0'
2024-12-13 08:19:50,904 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu2'
2024-12-13 08:19:50,904 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu1'
2024-12-13 08:19:50,905 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu3'
2024-12-13 08:19:50,905 INFO tuned.plugins.plugin_cpu: Setting boost value '1' for cpu 'cpu0'
2024-12-13 08:19:50,905 INFO tuned.daemon.daemon: static tuning from profile 'balanced' applied
So, to minimise latency, I now need to set it manually with sudo tuned-adm profile latency-performance because, as one can see in the log, it doesn’t stick anymore. How to diagnose and fix?
