Bug 1334479
| Summary: | tuned realtime profiles need rcu_nocbs | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Andrew Theurer <atheurer> | |
| Component: | tuned | Assignee: | Jaroslav Škarvada <jskarvad> | |
| Status: | CLOSED ERRATA | QA Contact: | Tereza Cerna <tcerna> | |
| Severity: | urgent | Docs Contact: | Jiri Herrmann <jherrman> | |
| Priority: | urgent | |||
| Version: | 7.2 | CC: | daolivei, hhuang, jeder, jherrman, jscotka, jskarvad, ksundara, lcapitulino, sgordon, skramaja, smazziot, snagar, tcerna | |
| Target Milestone: | rc | Keywords: | ZStream | |
| Target Release: | --- | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | tuned-2.7.0-1.el7 | Doc Type: | Release Note | |
| Doc Text: |
*rcu-nocbs* no longer missing from kernel boot parameters
Previously, the *rcu_nocbs* kernel parameter was not set in the `realtime-virtual-host` and `realtime-virtual-guest` tuned profiles. With this update, *rcu-nocbs* is set as expected.
|
Story Points: | --- | |
| Clone Of: | ||||
| : | 1367502 (view as bug list) | Environment: | ||
| Last Closed: | 2016-11-04 07:27:31 UTC | Type: | Bug | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 1240765, 1273048, 1367502 | |||
Upstream commit adding the fix: https://git.fedorahosted.org/cgit/tuned.git/commit/?id=2d89b31cf9c19c6526a4a6136fdcc037a49b4256 *** Bug 1356717 has been marked as a duplicate of this bug. *** As reported in bug 1356717, this issue is a blocker as you can't start VMs with the RT kernel starting with kernel-rt-3.10.0-439.rt56.327.el7. We need this for 7.2.z too. =========================================
Verified in:
tuned-2.7.1-2.el7.noarch
tuned-profiles-nfv-2.7.1-2.el7.noarch
PASS
=========================================
# cat /usr/lib/tuned/realtime-virtual-host/tuned.conf | grep cmdline
cmdline=isolcpus=${isolated_cores} nohz=on nohz_full=${isolated_cores} rcu_nocbs=${isolated_cores} intel_pstate=disable nosoftlockup
# cat /etc/tuned/realtime-virtual-host-variables.conf
isolated_cores=1
# tuned-adm profile realtime-virtual-host
# reboot
# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-493.el7.x86_64 root=/dev/mapper/rhel_dell--pe--fm120--2c-root ro crashkernel=auto rd.lvm.lv=rhel_dell-pe-fm120-2c/root rd.lvm.lv=rhel_dell-pe-fm120-2c/swap console=ttyS0,115200n81 isolcpus=1 nohz=on nohz_full=1 rcu_nocbs=1 intel_pstate=disable nosoftlockup
The same behavior is also for realtime-virtual-guest.
=========================================
Reproduced in:
tuned-2.5.1-7.el7.noarch
tuned-profiles-nfv-2.5.1-7.el7.noarch
FAIL
=========================================
# cat /usr/lib/tuned/realtime-virtual-host/tuned.conf | grep cmdline
cmdline=isolcpus=${isolated_cores} nohz=on nohz_full=${isolated_cores} intel_pstate=disable nosoftlockup
# cat /etc/tuned/realtime-virtual-host-variables.conf
isolated_cores=1
# tuned-adm profile realtime-virtual-host
# reboot
# cat /proc/cmdline
# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-493.el7.x86_64 root=/dev/mapper/rhel_dell--pe--fm120--2c-root ro crashkernel=auto rd.lvm.lv=rhel_dell-pe-fm120-2c/root rd.lvm.lv=rhel_dell-pe-fm120-2c/swap console=ttyS0,115200n81 isolcpus=1 nohz=on nohz_full=1 intel_pstate=disable nosoftlockup
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-2479.html |
Description of problem: tuned realtime-virtual-{host|guest] have rcu_nocbs missing from boot/kernel parameters Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. Activate either realtime-virtual-host or realtime-virtual-guest profiles 2. Reboot 3. cat /proc/cmdline Actual results: rcu_nocbs=$isolated_cores is missing Expected results: rcu_nocbs=$isolated_cores is included Additional info: /usr/lib/tuned/realtime/tuned.conf needs to be updated to include: cmdline=isolcpus=${isolated_cores} nohz_full=${isolated_cores} rcu_nocbs=${isolated_cores} intel_pstate=disable nosoftlockup