There has been no feedback to comments #18 and #19 for 2 years. Closing
this bug. If it still is an issue, please reopen the bug report.
** Changed in: thermald (Ubuntu)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/1797802
Title:
Erratic behavior of CPU frequency control under load
Status in thermald package in Ubuntu:
Won't Fix
Bug description:
I noticed that sometimes my Ubuntu 18.10 system feels sluggish. The
other times everything works fine. I don't know what triggers this
weird state. Suspend / resume? Maybe.
At first I thought this was maybe just a "perception issue", but then
when the sluggishness happened again, I fired up i7z and it looks that
CPU frequency almost never got over ~1600 MHz, But my CPU is perfectly
capable of going up to 4000 MHz!
I tried to fix it by setting
echo 80 > /sys/devices/system/cpu/intel_pstate/min_perf_pct
echo 80 > /sys/devices/system/cpu/intel_pstate/max_perf_pct
I hoped I would force the CPU into almost max performance state this
way. And indeed, once I ran these commands, i7z showed steady 3100+
MHz on all cores.
Then something weird happened - when I run some mild load on the CPU,
like just starting the IDE, during the startup the frequency **
dropped back to about 800-1600 MHz ** and returned to 3100 MHz after
the load was gone (IDE loaded).
The CPU core temperatures shown by sensors / i7z are ok and typically
at about 40-50 C when this slowdown happens, so this doesn't look like
thermal throttling.
Any ideas?
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-10-generic 4.18.0-10.11
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: pkolaczk 3281 F.... pulseaudio
/dev/snd/pcmC0D0c: pkolaczk 3281 F...m pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 14 22:16:50 2018
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-xenial-amd64-20160624-2
HibernationDevice: RESUME=UUID=4836842e-0116-43c4-98b4-7a56427f81f1
InstallationDate: Installed on 2017-04-12 (549 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary
20160624-10:47
MachineType: Dell Inc. Precision 5520
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=pl_PL.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-generic
root=UUID=7f76b1f0-8fef-41cc-86a2-99e554cb4d40 ro acpi_rev_override quiet
splash iwlwifi.power_save=1 crashkernel=384M-:128M crashkernel=384M-:128M
vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.18.0-10-generic N/A
linux-backports-modules-4.18.0-10-generic N/A
linux-firmware 1.175
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/24/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.11.0
dmi.board.name: 06X96V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.11.0:bd07/24/2018:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn06X96V:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5520
dmi.product.sku: 07BF
dmi.sys.vendor: Dell Inc.
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