Based on the analysis in the log, there does not appear to be a bug in systemd - which is behaving as intended, and defaulting to the best available cpufreq governor for low power consumption - but there may be a bug in the kernel resulting in the wrong scaling driver being used on the hardware in question. Reassigning to the kernel.
** Package changed: systemd (Ubuntu) => linux (Ubuntu) -- 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/1806012 Title: set-cpufreq: 'powersave' governor configuration sanity on ubuntu server Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Status in linux 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806012/+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
