[Bug 1973434] Re: massive performance issues since 22.04 upgrade

I have an update on this and quite a bit of more information, even
though not very clear what it means and how to further go on fully
fixing it:

After some more usage i realized that the performance is still pretty
weak when using my desktop system for slightly more "real" work.

I kept getting stutter in Video playback and Web browsers when using web
applications with the slightest bit of JavaScript functionality, and a
Virtualbox virtual machine.

I first suspected gnome-shell to be a culprit and had the impressions
things where sligthly better when using LXDE as a desktop environment,
but still I never got real good performance.

it's a real hard to get a grip on problem, as I dont know how to
instantly produce the problem and measure it as with normal bugs.

The easiest thing I can do is open a web browser, got to youtube, and open a few videos in new tabs and try to play them, and skip back and forth to different points, and "pretty soon" I get a stuttering in the video, a mouse pointer not moving fluently, switching tabs taking multiple seconds that usually works in an instant, a browser process with multiple 100s of % of CPU and a RRD* process.

these are things that work without a problem on a very old Lenovo x1 tablet with a mobile processor, and that i would expect to work equally easy on a pretty new X1 extreme with i9 processor and 32G Ram...

I did some more testing ( I cannot call it real debugging as I dont know
how to use proper tooling and stuff for these kind of analysis) and
checked how other Distributions and other Ubuntu versions perform from
USB Live systems and found that not only PopOS, but also Ubuntu 21.10,
BUT to my surprise also 22.04 from USB Live system behave much better.

So I thought i must have some setting wrong, but I didn't know which,
until i tried to turn off Intel Boost because I remembered in Ubuntu
Studio it is recommended to be turned off for good audio performance.
This helps a lot!

But, this is not what is different between 22.04 live - because there,
Intel boost is ON and it still behaves good.

I tried this with several browsers with always the same result, so it seems to be a generic graphics system/library, or kernel problem. It actually "feels" like some scheduling issue - which was the reason I tried the boost setting.
I also tried with a new test user, to make sure it's not a userspace local setting, or any browser plugin. But the same problems with a new, "clean" user.

The system I experience all this with has been installed first with
20.10, so it has multiple upgrades - it *could* be there is some other
setting from previous software versions thats broken - but I have no
idea what setting this could be and how I can search for it.

It could also be some old version of some gnome, X11 ( I also tried Xorg
as well as wayland, no noticeable difference) or graphics library, and
the kernel package is the wrong place for this bug, but I dont know
where to start with that then...

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https://bugs.launchpad.net/bugs/1973434

Title:
massive performance issues since 22.04 upgrade

Status in linux package in Ubuntu:
Confirmed

Bug description:
Hi,
After upgrading to 22.04 i had to fight with massive performance issues.

Browsers appeared to hang every other minute, youtube videos being
laggy and hang in between, applications in a virtualbox VM where slow
and also hanging every other minute to a level of not being useable.
On a pretty recent and powerful system just 2 years old.

I noticed CPU jumps in top, but also somehow thought it could be a graphics issue so invested some time installing nvidia drivers properly.
Also I wondered if it might be the lowlatency kernel I normally use because I do audio stuff, and switched to generic. But nothing helped.

ThenI had the idea it could be a kernel/scheduler issue because the
system wasn't always slow, but it appeared certain things kept hanging
when other processed had a lot of cpu for a few seconds.

So I got a recent mainline kernel, configured it with my last running
config from 21.10 before the update, made the debs and installed them,
and now can tell that a mainline kernel 5.17.7 with all the dkms
modules that i had before which got compiled automatically at
installation brings back a "normal" performance.

I can browse the web, run multiple youtube vids at once, even in
another browser, have thunderbird running, and a virtualbox machine
open with another browser for some web app testing and everything runs
fine and smooth, no lagging.

Not sure yet what the real reason is - either the kernel version, or a
patch in the ubuntu version, or the 22.04 kernel config so far, or
some configuration made in 21.10 that isn't good with 22.04 and it's
kernel anymore.

I will go ahead tomorrow and see if I can build a vanilla kernel with
the config from the ubuntu 22.04 kernel and "make oldconfig", then I
will be able to tell if only the config is making the difference.

Please let me know of there is anything I should test to further
analyze this issue, or any ideas I can try to solve it without having
to run a mainline manually installed kernel.

Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-generic 5.15.0.30.33
ProcVersionSignature: Ubuntu 5.15.0-30.31-generic 5.15.30
Uname: Linux 5.15.0-30-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: henning 6198 F.... pulseaudio
/dev/snd/controlC1: henning 6198 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sat May 14 23:02:38 2022
InstallationDate: Installed on 2020-04-12 (761 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: LENOVO 20QV00CEGE
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-30-generic root=/dev/mapper/vgubuntu-root ro
RelatedPackageVersions:
linux-restricted-modules-5.15.0-30-generic N/A
linux-backports-modules-5.15.0-30-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3
SourcePackage: linux
UpgradeStatus: Upgraded to jammy on 2022-04-28 (15 days ago)
dmi.bios.date: 12/06/2021
dmi.bios.release: 1.42
dmi.bios.vendor: LENOVO
dmi.bios.version: N2OET55W (1.42 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20QV00CEGE
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T08861 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.23
dmi.modalias: dmi:bvnLENOVO:bvrN2OET55W(1.42):bd12/06/2021:br1.42:efr1.23:svnLENOVO:pn20QV00CEGE:pvrThinkPadX1Extreme2nd:rvnLENOVO:rn20QV00CEGE:rvrSDK0T08861WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20QV_BU_Think_FM_ThinkPadX1Extreme2nd:
dmi.product.family: ThinkPad X1 Extreme 2nd
dmi.product.name: 20QV00CEGE
dmi.product.sku: LENOVO_MT_20QV_BU_Think_FM_ThinkPad X1 Extreme 2nd
dmi.product.version: ThinkPad X1 Extreme 2nd
dmi.sys.vendor: LENOVO

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