Description of problem: OSP 16.0 / RHEL 8.1 deployment, compute node with cpu-partitioning tuned profile set. tuned_params contains skew_tick=1 as expected, but /proc/cmdline only includes the '=1' part [root@central-compute-1 grub2]# tuned-adm active Current active profile: cpu-partitioning [root@central-compute-1 grub2]# cat /boot/grub2/grub.cfg | grep tuned_params= set tuned_params="skew_tick=1 nohz=on nohz_full=2-35,38-71 rcu_nocbs=2-35,38-71 tuned.non_isolcpus=00000030,00000003 intel_pstate=disable nosoftlockup" cat /proc/cmdline BOOT_IMAGE=(hd0,msdos2)/boot/vmlinuz-4.18.0-147.5.1.el8_1.x86_64 root=UUID=63a12e8d-4563-453e-9df5-d62a8fc0f0ea ro console=ttyS0 console=ttyS0,115200n81 no_timer_check crashkernel=auto rhgb quiet default_hugepagesz=1GB hugepagesz=1G hugepages=128 intel_iommu=on iommu=pt =1 nohz=on nohz_full=2-35,38-71 rcu_nocbs=2-35,38-71 tuned.non_isolcpus=00000030,00000003 intel_pstate=disable nosoftlockup (immediately following iommu=pt) Version-Release number of selected component (if applicable): 8.1 How reproducible: happened on all nodes deployed with cpu-partitioning or realtime-virtual-host Actual results: cmdline contains =1 Expected results: cmdline should contain skew_tick=1
This is probably dupe of bug 1669252.
Could you check with updated version of the grub and report back?
I have the updated version of grub and I still see this issue: grub2-common-2.02-81.el8.noarch redhat-release-8.2-1.0.el8.x86_64 cat /proc/cmdline BOOT_IMAGE=(hd0,msdos2)/boot/vmlinuz-4.18.0-193.1.2.rt13.53.el8_2.x86_64 root=UUID=63a12e8d-4563-453e-9df5-d62a8fc0f0ea ro console=ttyS0 console=ttyS0,115200n81 no_timer_check crashkernel=auto rhgb quiet default_hugepagesz=1GB hugepagesz=1G hugepages=350 nx_huge_pages_recovery_ratio=0 intel_iommu=on iommu=pt elevator=cfq audit=1 nomodeset intel_idle.max_cstate=1 tsc=reliable rcu_nocb_poll=1 clocksource=tsc pcie_aspm.policy=performance =1 isolcpus=managed_irq,domain,2-35,38-71 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=2-35,38-71 rcu_nocbs=2-35,38-71 # =1, but no skew_tick=1 (right before isolcpus) cat /etc/default/grub GRUB_TIMEOUT=1 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="console=ttyS0 console=ttyS0,115200n81 no_timer_check crashkernel=auto rhgb quiet" GRUB_DISABLE_RECOVERY="true" GRUB_ENABLE_BLSCFG=true GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT:+$GRUB_CMDLINE_LINUX_DEFAULT }\$tuned_params" TRIPLEO_HEAT_TEMPLATE_KERNEL_ARGS=" default_hugepagesz=1GB hugepagesz=1G hugepages=350 nx_huge_pages_recovery_ratio=0 intel_iommu=on iommu=pt elevator=cfq audit=1 nomodeset intel_idle.max_cstate=1 tsc=reliable rcu_nocb_poll=1 clocksource=tsc pcie_aspm.policy=performance" GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX:+$GRUB_CMDLINE_LINUX }${TRIPLEO_HEAT_TEMPLATE_KERNEL_ARGS}" GRUB_INITRD_OVERLAY="${GRUB_INITRD_OVERLAY:+$GRUB_INITRD_OVERLAY }\$tuned_initrd" cat /boot/grub2/grubenv # GRUB Environment Block saved_entry=0a922a89c7d06319ac184e86ac15b098-4.18.0-193.1.2.rt13.53.el8_2.x86_64 kernelopts=root=UUID=63a12e8d-4563-453e-9df5-d62a8fc0f0ea ro console=ttyS0 console=ttyS0,115200n81 no_timer_check crashkernel=auto rhgb quiet default_hugepagesz=1GB hugepagesz=1G hugepages=350 nx_huge_pages_recovery_ratio=0 intel_iommu=on iommu=pt elevator=cfq audit=1 nomodeset intel_idle.max_cstate=1 tsc=reliable rcu_nocb_poll=1 clocksource=tsc pcie_aspm.policy=performance $tuned_params boot_success=1 tuned_params=skew_tick=1 isolcpus=managed_irq,domain,2-35,38-71 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=2-35,38-71 rcu_nocbs=2-35,38-71 tuned_initrd= boot_indeterminate=0 ########################################################################################################################################################################################################################################################################################################################
Is it non-efi platform? If yes, you need to also reinstall grub by: # grub2-install ROOT_BOOT_DEVICE For example: # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vda 253:0 0 20G 0 disk `-vda1 253:1 0 20G 0 part / # grub2-install /dev/vda Installing for i386-pc platform. Installation finished. No error reported.
Thanks, running grub2-install did fix the issue. the newer version of grub2 was installed as part of a system update 8.1 -> 8.2, pretty much 'dnf update -y' Any idea why the update didn't take care of the re-install of grub on the root_boot_device?
It's probably grub feature. I think grub has never done it. I think it doesn't know what's your ROOT_BOOT_DEVICE and don't want to touch your MBR, because you could have there your own (or 3rd party) bootloader (e.g for multiboot). I proposed KB article about this problem. Now closing this bugzilla as a dupe. *** This bug has been marked as a duplicate of bug 1669252 ***