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DescriptionNitesh Narayan Lal
2020-06-09 21:18:59 UTC
Description of problem:
The tuned realtime-virtual-host profile doesn't complete the configuration as per script.sh when kernel-rt-kvm is missing or kvm module is not loaded.
Version-Release number of selected component (if applicable):
tuned-2.13.0-6.el8.noarch
How reproducible:
Every time
Steps to Reproduce:
1. Setup an RT host without kernel-rt-kvm package
2. Apply tuned realtime-virtual-host profile & reboot
3. Verify the error in tuned.log and by manually executing:
- cat /sys/kernel/ktimer_lockless_check
- systemctl status rt-entsk
Actual results:
[root@virtlab500 ~]# cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-193.7.1.rt13.58.el8_2.x86_64 root=/dev/mapper/rhel_virtlab500-root ro crashkernel=auto resume=/dev/mapper/rhel_virtlab500-swap rd.lvm.lv=rhel_virtlab500/root rd.lvm.lv=rhel_virtlab500/swap console=ttyS1,115200 skew_tick=1 isolcpus=managed_irq,domain,1,3,5,7,9,11,13,15 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,3,5,7,9,11,13,15 rcu_nocbs=1,3,5,7,9,11,13,15
[root@virtlab500 ~]# rpm -qa tuned
tuned-2.13.0-6.el8.noarch
[root@virtlab500 ~]# tuned-adm active
Current active profile: realtime-virtual-host
[root@virtlab500 ~]#
[root@virtlab500 ~]# cat /sys/kernel/ktimer_lockless_check
0
[root@virtlab500 ~]# systemctl status rt-entsk
● rt-entsk.service - RT Enable Netsocket Timestap Static Key daemon
Loaded: loaded (/usr/lib/systemd/system/rt-entsk.service; disabled; vendor preset: disabled)
Active: inactive (dead)
Expected results:
I think that the realtime-virtual-host profile should enable rt-entsk and set ktimer_lockless_check even if kernel-rt-kvm is missing or kvm module is not loaded. This is because realtime-virtual host consist of tuning that could impact not just guest latency but RT host latency as well.
Additional info:
2020-06-09 16:36:40,275 INFO tuned.plugins.plugin_cpu: energy_perf_bias successfully set to 'performance' on cpu 'cpu6'
2020-06-09 16:36:40,275 INFO tuned.plugins.plugin_cpu: setting new cpu latency 3
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'net.core.busy_read', the parameter does not exist
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: sysctl option net.core.busy_read will not be set, failed to read the original value.
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'net.core.busy_poll', the parameter does not exist
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: sysctl option net.core.busy_poll will not be set, failed to read the original value.
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'kernel.numa_balancing', the parameter does not exist
2020-06-09 16:36:40,277 ERROR tuned.plugins.plugin_sysctl: sysctl option kernel.numa_balancing will not be set, failed to read the original value.
2020-06-09 16:36:40,279 INFO tuned.plugins.plugin_sysctl: reapplying system sysctl
2020-06-09 16:36:40,280 WARNING tuned.plugins.plugin_vm: Option 'transparent_hugepages' is not supported on current hardware.
2020-06-09 16:36:40,281 INFO tuned.plugins.plugin_bootloader: installing additional boot command line parameters to grub2
2020-06-09 16:36:40,415 INFO tuned.plugins.plugin_script: calling script '/usr/lib/tuned/realtime/script.sh' with arguments '['start']'
2020-06-09 16:36:40,467 INFO tuned.plugins.plugin_script: calling script '/usr/lib/tuned/realtime-virtual-host/script.sh' with arguments '['start']'
2020-06-09 16:36:40,520 ERROR tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime-virtual-host/script.sh' error output: 'modinfo: ERROR: Module kvm not found.
modinfo: ERROR: Module kvm_intel not found.
/sys/module/kvm/parameters/lapic_timer_advance_ns not found'
2020-06-09 16:36:40,520 ERROR tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime-virtual-host/script.sh' returned error code: 1
2020-06-09 16:36:40,706 INFO tuned.daemon.daemon: static tuning from profile 'realtime-virtual-host' applied
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (tuned bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:1671