FS#73484 - [linux] CONFIG_NO_HZ_FULL is not set

Attached to Project: Arch Linux
Opened by Gustavo Alvarez (sl1pkn07) - Monday, 24 January 2022, 15:45 GMT
Last edited by Toolybird (Toolybird) - Thursday, 02 March 2023, 06:49 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 2
Private No

Details

is a recomendation for VFIO passtrought set the kernel parameter `nohz_full` for isolate the cpus used for virtualization machine [1]

bith this config is disabled in the actual kernel

[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=3ef60ebc-17d4-40a1-8710-2750e58f16e0 rw init=/usr/lib/systemd/systemd pci=nommconf intremap=no_x2apic_optout intel_iommu=on iommu=pt isolcpus=10,11,22,23,34,35,46,47 nohz_full=10,11,22,23,34,35,46,47 rcu_nocbs=10,11,22,23,34,35,46,47
[ 0.385821] Kernel command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=3ef60ebc-17d4-40a1-8710-2750e58f16e0 rw init=/usr/lib/systemd/systemd pci=nommconf intremap=no_x2apic_optout intel_iommu=on iommu=pt isolcpus=10,11,22,23,34,35,46,47 nohz_full=10,11,22,23,34,35,46,47 rcu_nocbs=10,11,22,23,34,35,46,47
[ 0.385950] Housekeeping: nohz unsupported. Build with CONFIG_NO_HZ_FULL
[ 0.385975] Unknown kernel command line parameters "BOOT_IMAGE=/vmlinuz-linux nohz_full=10,11,22,23,34,35,46,47 rcu_nocbs=10,11,22,23,34,35,46,47", will be passed to user space.
[ 3.087430] nohz_full=10,11,22,23,34,35,46,47

└───╼ zcat /proc/config.gz | grep CONFIG_NO_HZ_FULL
# CONFIG_NO_HZ_FULL is not set


please add support for this option

[1] https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Isolating_pinned_CPUs

greetings
This task depends upon

Closed by  Toolybird (Toolybird)
Thursday, 02 March 2023, 06:49 GMT
Reason for closing:  Fixed
Additional comments about closing:  CONFIG_NO_HZ_FULL is set these days.

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