Side note - the slight impact to default power consumption would negatively impact OEM partners certifying their hardware for EnergyStar etc., and would potentially force re-certification or failure of those certifications... the tools are there to change the setting when needed, but I unfortunately agree that changing the default is not a viable solution here.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2107977 Title: Make performance governor the default on AMD based systems. Status in linux package in Ubuntu: Won't Fix Bug description: During performance benchmarking it was realized performance governor is not the default. Would like to have the performance governor as the default. Here is the synopsis: --------------------------------------------------- Cut Here -------------------------------------------------------------------------- Ubuntu 25.04 has chosen to not go with the performance governor as the default. Because on the amd-pstate-epp driver, the default governor selection is hard-coded in the driver code. Which implies that to change the default governor, Ubuntu 25.04 would have had to change the driver code. OTOH, on acpi_cpufreq, the default governor selection is based on a config option which the distros are free to flip as per their choice. For example, On Ubuntu 22.04 (chooses schedutil as the default governor) # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y The arguments in favor of retaining the default of performance governor for the amd-pstate-epp would be as follows: • This governor provides the highest performance for wide range of server workloads as the OS requests the platform firmware to always provide the highest frequency at all times irrespective of the processor utilization. • This is independently corroborated by the Phoronix study • As amd-pstate-epp driver is only applicable on AMD platforms, retaining the upstream kernel defaults will not impact any other platforms, unlike in case of acpi-cpufreq driver which is also applicable for non-AMD platforms. • Furthermore, the upstream defaults for the amd-pstate-epp driver distinguish between AMD Server Platforms and AMD Client Platforms and choose appropriate default governors for both cases. The cons for retaining the default governor to performance would be that the platforms will consume slightly higher power compared to the powersave To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107977/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
