Public bug reported: We are seeing processes hogging the cpu. This problem does not appear in kernel 5.15 but does appear in later kernels. The main problem we are seeing is : workqueue: drm_fb_helper_damage_work hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND
but other workqueues have also been affected. Please see https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.5/+bug/2038492 I am also seeing workqueue: inode_switch_wbs_work_fn hogged. Use the following command in kernel 6.8 sudo grep hogged /var/log/kern.log sudo grep hogged /var/log/kern.log.1 I don't see the problem in kernel 5.15. We are testing 5G and we are seeing added latencies in our test results. This appears to be after we have updated our kernel. 5.15.0-139-generic modinfo drm_kms_helper filename: /lib/modules/5.15.0-139-generic/kernel/drivers/gpu/drm/drm_kms_helper.ko license: GPL and additional rights description: DRM KMS helper author: David Airlie, Jesse Barnes license: GPL srcversion: B10D61A5F1428A1941A4519 depends: drm,cec,fb_sys_fops,syscopyarea,sysfillrect,sysimgblt retpoline: Y intree: Y name: drm_kms_helper vermagic: 5.15.0-139-generic SMP mod_unload modversions 6.8.0-52-generic modinfo drm_kms_helper name: drm_kms_helper filename: (builtin) import_ns: DMA_BUF license: GPL and additional rights file: drivers/gpu/drm/drm_kms_helper description: DRM KMS helper author: David Airlie, Jesse Barnes license: GPL file: drivers/gpu/drm/drm_kms_helper parm: fbdev_emulation:Enable legacy fbdev emulation [default=true] (bool) parm: drm_fbdev_overalloc:Overallocation of the fbdev buffer (%) [default=100] (int) parm: poll:bool ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2112307 Title: Processes hogging CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2112307/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
