Hi Henning, That is great news that "intel_iommu=off" on the kernel command line did the trick.
You can follow this bug to get updates on when we will be disabling IOMMU by default in the 5.15 kernel. It should be soon, the patches are already submitted, and reviewed by the kernel team. The next step is for the patch to be applied to the git tree and the next kernel update built. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971699 I'll let you know once there is a kernel in -proposed with IOMMU disabled. The patches missed this current SRU cycle, and will be in the next one, so it might be in a few weeks / months time. Thanks, Matthew -- 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/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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973434/+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
