group.of.nepali.translators team mailing list archive

[Dan Streetman <dan.streetman@xxxxxxxxxxxxx>]

> Reassigning to the kernel

please don't.  This is a bug in systemd because its set-cpufreq script
provides no way for the user to override its hardcoded values of what
governor it select.  We will be providing a systemd patch to add user
configurability.

** Package changed: linux (Ubuntu) => systemd (Ubuntu)

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https://bugs.launchpad.net/bugs/1806012

Title:
  set-cpufreq: 'powersave' governor configuration sanity on ubuntu
  server

Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Cosmic:
  In Progress
Status in systemd source package in Disco:
  In Progress

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/behavioural
  difference in the underlying kernel when a machine is under load.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.9
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
  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-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-39-generic root=UUID=a361a524-47eb-46c3-8a04-e5eaa65188c9 ro hugepages=103117 iommu=pt intel_iommu=on
  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.:bvr2.3.4:bd11/08/2016:svnDellInc.:pnPowerEdgeR630:pvr:rvnDellInc.:rn02C2CP:rvrA03:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R630
  dmi.sys.vendor: Dell Inc.

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