Updated commentary to include 6.8.0-111-generic ** Description changed: - Here's an ODD 'feature' of kernel 6.8.0 (-106,-107, -110) I'm running - into: + Here's an ODD 'feature' of kernel 6.8.0 (-106,-107,-110,-111) I'm + running into: I run VMware Workstation 17 Pro (17.6.4 build-24832109) and have used "Slices" to Assign Core Affinity for the Host OS, User Apps and VMs: System Slice = SMP Cores 0-3 User Slice = SMP Cores 4-7 This is done in order to maximize the performance of the VMs (CAElinux, Kubuntu, MS Windows 10/11 Pro, etc.) by modding the *.vmx files to map the VMs onto only the upper 4-cores of the processor. It works, Rock Solid (on -101). I've been running VMs in this manner for some time (years) now. When I run on -106 (and now -107) the VMs get REAL 'Choppy' and begin seeing audio breakup and are no longer capable of maximum "Core Utilization" on the upper 4-cores. I've observed the above in both OCCT and applications with 3D graphics and audio being run in both of the Windows VMs (I no longer run MS on Bare Metal). I have attached System Monitor History Screen Captures that illustrate the impact. OS: Kubuntu 24.04.4 (LTS) KDE Plasma: 5.27.12 KDE Frameworks: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-106-generic (64-bit) Graphics Platform: X11 Processors: 8 × AMD FX(tm)-8320 Eight-Core Processor Memory: 15.7 GiB of RAM Graphics Processor: PITCAIRN Motherboard: Gigabyte Technology Co., Ltd. linux-image-6.8.0-106-generic: Installed: 6.8.0-106.106 Candidate: 6.8.0-106.106 Version table: *** 6.8.0-106.106 500 500 http://us.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 500 http://us.archive.ubuntu.com/ubuntu noble-security/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-image-6.8.0-106-generic 6.8.0-106.106 ProcVersionSignature: Ubuntu 6.8.0-106.106-generic 6.8.12 Uname: Linux 6.8.0-106-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tamaster 3442 F.... wireplumber /dev/snd/controlC1: tamaster 3442 F.... wireplumber /dev/snd/seq: tamaster 3438 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Tue Mar 24 11:56:40 2026 InstallationDate: Installed on 2020-10-10 (1991 days ago) InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-106-generic root=UUID=4918d7fa-4d57-4dc6-a309-1e93b981ad68 ro iommu=soft quiet splash transparent_hugepage=never preempt=full nohz_full=all threadirqs vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-6.8.0-106-generic N/A linux-backports-modules-6.8.0-106-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.25 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to noble on 2024-08-30 (571 days ago) dmi.bios.date: 05/28/2015 dmi.bios.release: 4.6 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F3 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: 990FXA-UD3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF3:bd05/28/2015:br4.6:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn990FXA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:skuTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: To be filled by O.E.M. dmi.product.sku: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2146027 Title: Virtual Machine Performance Impacted Status in linux package in Ubuntu: New Bug description: Here's an ODD 'feature' of kernel 6.8.0 (-106,-107,-110,-111) I'm running into: I run VMware Workstation 17 Pro (17.6.4 build-24832109) and have used "Slices" to Assign Core Affinity for the Host OS, User Apps and VMs: System Slice = SMP Cores 0-3 User Slice = SMP Cores 4-7 This is done in order to maximize the performance of the VMs (CAElinux, Kubuntu, MS Windows 10/11 Pro, etc.) by modding the *.vmx files to map the VMs onto only the upper 4-cores of the processor. It works, Rock Solid (on -101). I've been running VMs in this manner for some time (years) now. When I run on -106 (and now -107) the VMs get REAL 'Choppy' and begin seeing audio breakup and are no longer capable of maximum "Core Utilization" on the upper 4-cores. I've observed the above in both OCCT and applications with 3D graphics and audio being run in both of the Windows VMs (I no longer run MS on Bare Metal). I have attached System Monitor History Screen Captures that illustrate the impact. OS: Kubuntu 24.04.4 (LTS) KDE Plasma: 5.27.12 KDE Frameworks: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-106-generic (64-bit) Graphics Platform: X11 Processors: 8 × AMD FX(tm)-8320 Eight-Core Processor Memory: 15.7 GiB of RAM Graphics Processor: PITCAIRN Motherboard: Gigabyte Technology Co., Ltd. linux-image-6.8.0-106-generic: Installed: 6.8.0-106.106 Candidate: 6.8.0-106.106 Version table: *** 6.8.0-106.106 500 500 http://us.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 500 http://us.archive.ubuntu.com/ubuntu noble-security/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-image-6.8.0-106-generic 6.8.0-106.106 ProcVersionSignature: Ubuntu 6.8.0-106.106-generic 6.8.12 Uname: Linux 6.8.0-106-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tamaster 3442 F.... wireplumber /dev/snd/controlC1: tamaster 3442 F.... wireplumber /dev/snd/seq: tamaster 3438 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Tue Mar 24 11:56:40 2026 InstallationDate: Installed on 2020-10-10 (1991 days ago) InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-106-generic root=UUID=4918d7fa-4d57-4dc6-a309-1e93b981ad68 ro iommu=soft quiet splash transparent_hugepage=never preempt=full nohz_full=all threadirqs vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-6.8.0-106-generic N/A linux-backports-modules-6.8.0-106-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.25 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to noble on 2024-08-30 (571 days ago) dmi.bios.date: 05/28/2015 dmi.bios.release: 4.6 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F3 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: 990FXA-UD3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF3:bd05/28/2015:br4.6:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn990FXA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:skuTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: To be filled by O.E.M. dmi.product.sku: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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