Description of problem:
install F-15-alpha-tc1 using rawhide repo and reboot, 'NMI watchdog disabled for cpu 0: unable to create perf event:-2' was shown on boot. Manually add nmi_watchdog=1 to kernel, it seemed NMI watchdog still disabled since that line is displayed again.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install rawhide by: http://serverbeach1.fedoraproject.org/pub/alt/stage/15-Alpha.TC1
2. When reboot, 'NMI watchdog disabled for cpu 0: unable to create perf event:-2' note is shown.
Created attachment 477969 [details]
This is probably caused by the broken PMU hardware reported in the line above:
[ 0.041061] Performance Events: Broken PMU hardware detected, using software events only.
Yeah the PMU isn't emulated on virtual cpus.
I pushed patches upstream to make this message more human readable, not sure if it went into 2.6.38 or not.
So technically this isn't a bug, but the output message should probably be tweaked or something.
The same problem occurs with with RHEL 6.1 Beta.
[root@x86-006 ~]# uname -r
[root@x86-006 ~]# dmesg | grep perf
NMI watchdog disabled for cpu0: unable to create perf event: -2
NMI watchdog disabled for cpu1: unable to create perf event: -2
NMI watchdog disabled for cpu2: unable to create perf event: -2
NMI watchdog disabled for cpu3: unable to create perf event: -2
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.
(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)
More information and reason for this action is here:
Closing this as PMU support has been in virtual CPUs for a while now