set-cpufreq: 'powersave' governor configuration sanity on ubuntu server
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
systemd (Ubuntu) |
Won't Fix
|
Medium
|
Ioanna Alifieraki | ||
Xenial |
Won't Fix
|
Medium
|
Ioanna Alifieraki | ||
Bionic |
Won't Fix
|
Medium
|
Ioanna Alifieraki | ||
Cosmic |
Won't Fix
|
Medium
|
Ioanna Alifieraki | ||
Disco |
Won't Fix
|
Medium
|
Ioanna Alifieraki |
Bug Description
Whilst debugging 'slow instance performance' on a Ubuntu Bionic based cloud, I observed that the default cpu governor configuration was set to 'powersave'; toggling this to 'performance' (while in not anyway a particularly green thing todo) resulted in the instance slowness disappearing and the cloud performance being as expected (based on a prior version of the deploy on Ubuntu Xenial).
AFAICT Xenial does the same thing albeit in a slight different way, but we definitely did not see the same performance laggy-ness under a Xenial based cloud.
Raising against systemd (as this package sets the governor to 'powersave') - I feel that the switch to 'performance' although appropriate then obscures what might be a performance/
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: systemd 237-3ubuntu10.9
ProcVersionSign
Uname: Linux 4.15.0-39-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Fri Nov 30 10:05:46 2018
Lsusb:
Bus 002 Device 002: ID 8087:8002 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub
Bus 001 Device 002: ID 8087:800a Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge R630
ProcEnviron:
TERM=xterm-
PATH=(custom, no user)
XDG_RUNTIME_
LANG=C.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/08/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.4
dmi.board.name: 02C2CP
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.
dmi.product.name: PowerEdge R630
dmi.sys.vendor: Dell Inc.
Related branches
- Steve Langasek (community): Disapprove
- Dimitri John Ledkov: Pending requested
- git-ubuntu developers: Pending requested
-
Diff: 66 lines (+30/-22)1 file modifieddebian/extra/set-cpufreq (+30/-22)
tags: | added: sts sts-sponsor-ddstreet |
Changed in systemd (Ubuntu Disco): | |
importance: | Undecided → Medium |
Changed in systemd (Ubuntu Cosmic): | |
importance: | Undecided → Medium |
Changed in systemd (Ubuntu Bionic): | |
importance: | Undecided → Medium |
Changed in systemd (Ubuntu Xenial): | |
importance: | Undecided → Medium |
Changed in systemd (Ubuntu Disco): | |
status: | New → In Progress |
Changed in systemd (Ubuntu Cosmic): | |
status: | New → In Progress |
Changed in systemd (Ubuntu Bionic): | |
status: | New → In Progress |
Changed in systemd (Ubuntu Xenial): | |
status: | New → In Progress |
Changed in systemd (Ubuntu Disco): | |
assignee: | nobody → Ioanna Alifieraki (joalif) |
Changed in systemd (Ubuntu Cosmic): | |
assignee: | nobody → Ioanna Alifieraki (joalif) |
Changed in systemd (Ubuntu Bionic): | |
assignee: | nobody → Ioanna Alifieraki (joalif) |
Changed in systemd (Ubuntu Xenial): | |
assignee: | nobody → Ioanna Alifieraki (joalif) |
tags: | added: rls-x-notfixing |
tags: | removed: sts sts-sponsor-ddstreet |
Just to add some more detail to this bug; for the impacted deployment we actually ended up re-configuring the power regulator settings via the BIOS to delegate to the OS for control; after a reboot we've just stuck with the default ondemand behaviour and performance has been consistent/better than before.