Updated commentary to include 6.8.0-107-generic ** Description changed:
- Here's an ODD 'feature' of kernel 6.8.0-106 I'm running into: + Here's an ODD 'feature' of kernel 6.8.0 (-106,-107) 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 - - 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). - - When I run on -106 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. + 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 + 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 + 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 a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2146027 Title: Virtual Machine Performance Impacted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2146027/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
