[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
** Also affects: linux (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: systemd (Ubuntu Focal) Importance: Undecided Status: New ** Changed in: systemd (Ubuntu Focal) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
Hello! Regarding the comment #8, I didn't get the same positive experience on my side. It was more closer to what is described in comment #9. See bug 1889479 for more details. I would suggest switching back to powersave/ondemand either with a new service or the kernel config. Having a dedicated service could be confusing for people who try to change the kernel settings. But it could be more flexible. Cheers, Matt -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
I've added the OEM Solutions Group team for awareness. I'm not sure what the final fix will be since servers' and desktops'/laptops' ideal default seem to be different, but most likely the certification tests should be adjusted if we don't end up restoring the previous behaviour of the ondemand.service unconditionally. The latest LTS release, 20.04 is not affected so the certification test changes are probably not very urgent. -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
> In benchmarking we didn't observe much computational difference between the too once the CPU is fully loaded. However, cranking up or cranking down the load one will discover that the performance setting is more responsive than powersave. this is exactly the problem in production environments; workloads can be 'bursty' which can see not-insignificant performance reduction when using powersave. Many enterprise users even go so far as to disable C-states (and ASPM, and APST, etc...). > It makes sense to default to powersave for most scenarios, especially for laptop users. for laptop users, yeah. I question if 'most scenarios' is accurate. -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
> I would suggest switching back to powersave/ondemand either with a new service or the kernel config. re: new service, the existing package cpufrequtils (and related package cpufreqd) provides a configurable service to manage governor settings (and other related settings). The old ondemand service was not configurable at all and caused quite a bit of unexpected problems, as well as 'battling' (overriding) the cpufrequtils service when it was installed. > Having a dedicated service could be confusing for people who try to change the kernel settings. indeed, it was, especially when there were multiple services to (try to) control the settings that conflicted with each other. -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
passing intel_pstate=disable_hwp on the kernel commandline causes the kernel to scale the Core i5-8250U down to 1.6 GHz in performance mode, but that's still a bit off from the 900 MHz it scales down to in powersave mode. I believe Windows also does not run the CPUs in performance mode by default on mobile devices (but in balanced or balanced performance), I don't know about stationary ones. Performance governor on laptops should be restricted to gamemode. -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
@colin-king @juliank It feels to me that the oem flavour should default to (powersave/ondemand), as it is more-or-less laptop kernel flavour. I feel like generic kernel flavour should remain on performance. I feel like we should have a unit, that for chassis=laptop turns on (powersave/ondemand). Possibly shipped in like procps package. Or there should be like graphical desktop integration to control this (aka game mode). Is there a per-chasis type setting in kernel? as in something like CONFIG_WHEN_ON_LAPTOP_DEFAULT_GOV_* ? Do above actionable things make sense? -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
The choice was made from running analysis on a wide range of Intel machines, old and new. We are trying to select the optimal choice for a wide range of CPUs for a wide range of use cases. Generally speaking, the intel-pstate governor has deeper understanding of the processor features and can access CPU metrics that can guide it to making an informed choice. >From our understanding, The intel-pstate driver should be the optimal choice for Intel Sandy Bridge CPUs onwards. The intel-pstate driver supports only the performance and powersave governors. In benchmarking we didn't observe much computational difference between the too once the CPU is fully loaded. However, cranking up or cranking down the load one will discover that the performance setting is more responsive than powersave. The overall compute throughput when fully loaded is the same, it's just a case that powersave may take a little longer to crank up to the full speed. It makes sense to default to powersave for most scenarios, especially for laptop users. Pre-Intel Sandy Bridge or non-x86 CPUs will default back to the non- intel pstate governor. So, question: Which kernel(s) are you referring to? -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor
@Colin: I agree with all of that. Our kernel-side default is not powersave, but performance, across generic and oem, at the very least: $ grep CPU_FREQ_DEFAULT_GOV_.*=y /boot/config-5.* /boot/config-5.4.0-26-generic:CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y /boot/config-5.4.0-42-generic:CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y /boot/config-5.6.0-1018-oem:CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y /boot/config-5.6.0-1020-oem:CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y We used to set that to powersave (and ondemand on non-pstate) in ondemand.service, but have since removed the service in groovy. I believe the default governor kernel-side outside Ubuntu is usually CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND, which translates to ondemand pre- pstates, and powersave on pstates (compare Fedora), whereas Enterprise systems usually pick PERFORMANCE too (compare RHEL) - probably because most distributions focus on normal end users and enterprise on server and workstation. We don't have that distinction of course, so I'm not sure what the best way out is - default to powersave/ondemand and make server installer write performance - or vice versa default to performance and make ubiquity configure powersave for desktop. -- You received this bug notification because you are a member of Ubuntu Desktop, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1885730 Title: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
