Public bug reported:
Hey everybody,
I'm suspecting this is some form of bug but I'm not sure what the cause
is. Also, I rarely report bugs so please let me know if I handled this
correctly and if you need more information.
After upgrading from Kubuntu 24.04 to 24.10 I'm seeing a severe
performance regression when multitasking. My system seems to be swapping
way more often than before. Even when just switching between the same
Firefox window and another window, it is often taking up to ten seconds
or more for the window to be responsive again. Almost every time the
Firefox window I'm switching to is desaturated, which almost never
happened in Kubuntu 24.04.
I'm one of those people who keeps a lot of browser tabs and windows
open. I'm using Firefox and I usually have about 60 windows open. That
was still manageable under 24.04 with ZSWAP. With 24.10 it is bordering
on unusable. I haven't increased the number of windows or tabs after
upgrading to 24.10 significantly. The lagginess of 24.10 has been
apparent from the first day of using 24.10.
Also, the mouse cursor now lags very often. When I hover over the
Firefox icon in the taskbar and the window preview pops up, the system
immediately starts swapping + compressing/decompressing as is apparent
in the system monitor. The same thing happens when I click on the
Firefox icon and I get an overview of all the opened Firefox windows.
For some reason the system then also starts to swap and work like crazy,
although it already displays all window previews. To me it seems like
the previews are being refreshed or something?
It always feels like the system is running circles around itself. Memory
pages that have just been used don't seem to stay in memory. I've used
vm.swappiness = 60 per default with 24.04. To try to solve the
performance issues in 24.10 I've decreased vm.swappiness to 10 but this
didn't help.
As you can see in the added graphs from munin, something happened with
memory consumption and swapping after upgrading to 24.10.
ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.11.0-9.9-generic 6.11.0
Uname: Linux 6.11.0-9-generic x86_64
ApportVersion: 2.30.0-0ubuntu4
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: KDE
Date: Thu Oct 24 11:35:38 2024
DistUpgraded: 2024-10-10 19:22:51,917 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: oracular
DistroVariant: ubuntu
DkmsStatus:
virtualbox/7.0.20, 6.11.0-8-generic, x86_64: installed
virtualbox/7.0.20, 6.11.0-9-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:05a4]
InstallationDate: Installed on 2023-03-16 (588 days ago)
InstallationMedia: Kubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64
(20230223)
MachineType: Dell Inc. OptiPlex 9020
ProcEnviron:
LANG=de_DE.UTF-8
LANGUAGE=de:en_US
PATH=(custom, no user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-9-generic
root=UUID=5adc739b-f1f0-4d34-8602-32e873ad1172 ro
resume=UUID=aceef760-430c-4016-8bd2-6bb0466cb436 zswap.enabled=1
zswap.compressor=lz4 zswap.max_pool_percent=20 zswap.zpool=z3fold quiet splash
vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oracular on 2024-10-10 (14 days ago)
dmi.bios.date: 05/30/2019
dmi.bios.release: 65.25
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A25
dmi.board.name: 0XCR8D
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 15
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA25:bd05/30/2019:br65.25:svnDellInc.:pnOptiPlex9020:pvr00:rvnDellInc.:rn0XCR8D:rvrA03:cvnDellInc.:ct15:cvr:sku05A4:
dmi.product.name: OptiPlex 9020
dmi.product.sku: 05A4
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.122-1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.2.3-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 23.0.4-0ubuntu1~23.04.1
version.xserver-xorg-core: xserver-xorg-core 2:21.1.13-2ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-3ubuntu1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug kubuntu oracular performance ubuntu wayland-session
** Attachment added: "meminfo.txt"
https://bugs.launchpad.net/bugs/2085519/+attachment/5831290/+files/meminfo.txt
--
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/2085519
Title:
Performance regression in KDE Plasma 6.1.5 after upgrading to Kubuntu
24.10
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