Proper way to set default CPU Governor?

sluflyer06

Hi,

I want to set 'ondemand' as the default boot CPU governor, for my uses on my VM host (r730xd), I can save a substantial amount of energy when the box isn't busy if the cpu's are allowed to downclock.

I read a guide that said to edit the grub file and then rebuild but that broke xcp-ng, so I want to ask the right way to do this.

Thank you!

tuxen

@sluflyer06 In order to persist across reboots, you must set the cpufreq boot option. There's no need to rebuild grub because the change will occur at Xen level (instead of dom0):

/opt/xensource/libexec/xen-cmdline --set-xen cpufreq=xen:ondemand

After that, change the System power profile to Performance Per Watt (OS) in BIOS.

Verifying the config:

Check if the attribute current_governor is set to ondemand:

xenpm get-cpufreq-para

Check the clock scaling:

xenpm start 1|grep "Avg freq"

More info:
https://support.citrix.com/article/CTX200390/power-settings-in-citrix-hypervisor-cstates-turbo-and-cpu-frequency-scaling

sluflyer06

@tuxen Thank You, looks like it's booting on the selected cpu scaling now.