** Description changed:
- In a recent merge from Debian we lost ondemand.service, meaning all CPUs
- now run in Turbo all the time when idle, which is clearly suboptimal.
+ [Impact]
- The discussion in bug 1806012 seems misleading, focusing on p-state vs
- other drivers, when in fact, the script actually set the default
- governor for the pstate driver on platforms that use pstate. Everything
- below only looks at systems that use pstate.
+ * Kernel should have sensible default governor set to ondemand for the
+ generic & oem kernel flavours in Focal and Groovy+ for amd64.
- pstate has two governors: performance and powerstate. performance runs
- CPU at maximum frequency constantly, and powersave can be configured
- using various energy profiles energy profiles:
+ * ondemand.service must not be shipped by systemd package
- - performance
- - balanced performance
- - balanced power
- - power
+ * kvm, cloud-kernels should continue using performance governor.
- It defaults to balanced performance, I think, but I'm not sure.
+ * Users should be given control to rev-up to performance, or rev-down
+ to powersave using other tools, i.e. game-mode and/or similar CLI or GUI
+ tools (these are scheduled to be integrated on Ubuntu platform later).
- Whether performance governor is faster than powersave governor is not
- even clear. https://www.phoronix.com/scan.php?page=article&item=linux50
- -pstate-cpufreq&num=5 benchmarked them, but did not benchmark the
- individual energy profiles.
+ [Test Case]
- For a desktop/laptop, the expected behavior is the powersave governor
- with balanced_performance on AC and balanced_power on battery.
+ * Boot ubuntu generic, hwe, or oem kernel
- I don't know about servers or VMs, but the benchmark series seems to
- indicate it does not really matter much performance wise.
+ * Check that default governor is ondemand
- I think most other distributions configure their kernels to use the
- powersave governor by default, whereas we configure it to use the
- performance governor and then switch it later in the boot to get the
- maximum performance during bootup. It's not clear to me that's actually
- useful.
+ * Check that ondemand.service is not active
+
+ [Regression Potential]
+
+ * ondemand governor is the best kernel default as recently analyzed by
+ colin king, it gives a balance bootspeed and power, giving as responsive
+ machines whilst not wasting power. It is the best experience we can give
+ our users by default.
+
+ [Other Info]
+
+ * It is up to the user to elect/switch to powersave for maximum battery
life, or to the performance for maximum processing power (i.e. gaming /
computation).
** Summary changed:
- Please switch default kernel governor to ondemand, such that advanced
userspace utilities such as game-mode can be later used to rev-up to to
performance, or rev-down to powersave.
+ Please switch default, hwe, oem kernel flavours governor to
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y , such that advanced userspace utilities
such as game-mode can be later used to rev-up to to performance, or rev-down to
powersave.
** Description changed:
[Impact]
- * Kernel should have sensible default governor set to ondemand for the
- generic & oem kernel flavours in Focal and Groovy+ for amd64.
+ * Kernel should have sensible default governor set to
+ CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic & oem kernel
+ flavours in Focal and Groovy+ for amd64.
- * ondemand.service must not be shipped by systemd package
+ * ondemand.service must not be shipped by systemd package
- * kvm, cloud-kernels should continue using performance governor.
+ * kvm, cloud-kernels should continue using performance governor.
- * Users should be given control to rev-up to performance, or rev-down
+ * Users should be given control to rev-up to performance, or rev-down
to powersave using other tools, i.e. game-mode and/or similar CLI or GUI
tools (these are scheduled to be integrated on Ubuntu platform later).
[Test Case]
- * Boot ubuntu generic, hwe, or oem kernel
+ * Boot ubuntu generic, hwe, or oem kernel
- * Check that default governor is ondemand
+ * Check that default governor is ondemand
- * Check that ondemand.service is not active
+ * Check that ondemand.service is not active
[Regression Potential]
- * ondemand governor is the best kernel default as recently analyzed by
+ * ondemand governor is the best kernel default as recently analyzed by
colin king, it gives a balance bootspeed and power, giving as responsive
machines whilst not wasting power. It is the best experience we can give
our users by default.
[Other Info]
-
- * It is up to the user to elect/switch to powersave for maximum battery
life, or to the performance for maximum processing power (i.e. gaming /
computation).
+
+ * It is up to the user to elect/switch to powersave for maximum battery
+ life, or to the performance for maximum processing power (i.e. gaming /
+ computation).
** Description changed:
[Impact]
* Kernel should have sensible default governor set to
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic & oem kernel
- flavours in Focal and Groovy+ for amd64.
+ flavours in Focal and Groovy+.
* ondemand.service must not be shipped by systemd package
* kvm, cloud-kernels should continue using performance governor.
* Users should be given control to rev-up to performance, or rev-down
to powersave using other tools, i.e. game-mode and/or similar CLI or GUI
tools (these are scheduled to be integrated on Ubuntu platform later).
[Test Case]
* Boot ubuntu generic, hwe, or oem kernel
* Check that default governor is ondemand
* Check that ondemand.service is not active
[Regression Potential]
* ondemand governor is the best kernel default as recently analyzed by
colin king, it gives a balance bootspeed and power, giving as responsive
machines whilst not wasting power. It is the best experience we can give
our users by default.
[Other Info]
* It is up to the user to elect/switch to powersave for maximum battery
life, or to the performance for maximum processing power (i.e. gaming /
computation).
** Description changed:
[Impact]
* Kernel should have sensible default governor set to
- CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic & oem kernel
- flavours in Focal and Groovy+.
+ CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic, hwe, raspi,
+ riscv64, oem kernel flavours in Focal and Groovy+.
* ondemand.service must not be shipped by systemd package
- * kvm, cloud-kernels should continue using performance governor.
+ * ppc64el, kvm / cloud-kernels should continue using performance
+ governor.
* Users should be given control to rev-up to performance, or rev-down
to powersave using other tools, i.e. game-mode and/or similar CLI or GUI
tools (these are scheduled to be integrated on Ubuntu platform later).
[Test Case]
* Boot ubuntu generic, hwe, or oem kernel
* Check that default governor is ondemand
* Check that ondemand.service is not active
[Regression Potential]
* ondemand governor is the best kernel default as recently analyzed by
colin king, it gives a balance bootspeed and power, giving as responsive
machines whilst not wasting power. It is the best experience we can give
our users by default.
[Other Info]
* It is up to the user to elect/switch to powersave for maximum battery
life, or to the performance for maximum processing power (i.e. gaming /
computation).
** Description changed:
[Impact]
* Kernel should have sensible default governor set to
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic, hwe, raspi,
riscv64, oem kernel flavours in Focal and Groovy+.
* ondemand.service must not be shipped by systemd package
- * ppc64el, kvm / cloud-kernels should continue using performance
- governor.
+ * ppc64el, kvm flavour, cloud-kernels flavours should continue using
+ performance governor.
* Users should be given control to rev-up to performance, or rev-down
to powersave using other tools, i.e. game-mode and/or similar CLI or GUI
tools (these are scheduled to be integrated on Ubuntu platform later).
[Test Case]
* Boot ubuntu generic, hwe, or oem kernel
* Check that default governor is ondemand
* Check that ondemand.service is not active
[Regression Potential]
* ondemand governor is the best kernel default as recently analyzed by
colin king, it gives a balance bootspeed and power, giving as responsive
machines whilst not wasting power. It is the best experience we can give
our users by default.
[Other Info]
* It is up to the user to elect/switch to powersave for maximum battery
life, or to the performance for maximum processing power (i.e. gaming /
computation).
** Also affects: linux-riscv (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
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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/1885730
Title:
Please switch default, hwe, oem kernel flavours governor to
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y , such that advanced userspace
utilities such as game-mode can be later used to rev-up to to
performance, or rev-down to powersave.
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.6 package in Ubuntu:
New
Status in linux-riscv package in Ubuntu:
New
Status in systemd package in Ubuntu:
Invalid
Status in linux source package in Focal:
Triaged
Status in linux-oem-5.6 source package in Focal:
New
Status in linux-riscv source package in Focal:
New
Status in systemd source package in Focal:
Fix Released
Status in linux source package in Groovy:
In Progress
Status in linux-oem-5.6 source package in Groovy:
New
Status in linux-riscv source package in Groovy:
New
Status in systemd source package in Groovy:
Invalid
Bug description:
[Impact]
* Kernel should have sensible default governor set to
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic, hwe, raspi,
riscv64, oem kernel flavours in Focal and Groovy+.
* ondemand.service must not be shipped by systemd package
* ppc64el, kvm flavour, cloud-kernels flavours should continue using
performance governor.
* Users should be given control to rev-up to performance, or rev-down
to powersave using other tools, i.e. game-mode and/or similar CLI or
GUI tools (these are scheduled to be integrated on Ubuntu platform
later).
[Test Case]
* Boot ubuntu generic, hwe, or oem kernel
* Check that default governor is ondemand
* Check that ondemand.service is not active
[Regression Potential]
* ondemand governor is the best kernel default as recently analyzed
by colin king, it gives a balance bootspeed and power, giving as
responsive machines whilst not wasting power. It is the best
experience we can give our users by default.
[Other Info]
* It is up to the user to elect/switch to powersave for maximum
battery life, or to the performance for maximum processing power (i.e.
gaming / computation).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+subscriptions
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