[Users] Lots of interrupts since latest el6 kernel

[Vasily Averin]

Dear Karl,
thank you for reporting the problem.

no, it is not known issue.
moreover, I doubt it is related to real hardware interrupts,
soft-interrupts handles delayed procedures like processing of network packets.

For troubleshooting is to look at stack of affected running processes via /proc/<pid>/stack
alternatively you can use magic sysrq key
# echo l > /proc/sysrq-trigger 
it should dump current state of all running processors.
you can do it few times to monitor state of affected processes.

Thank you,
	Vasily Averin


On 5/30/19 7:54 PM, Karl Johnson wrote:
> Hello,
> 
> I've upgraded from 2.6.32-042stab133.2 to 2.6.32-042stab138.1 and since boot, 2 cores are using 100% cpu on ksoftirqd:
> 
> root          21 99.9  0.0      0     0 ?        R    May29 1178:07  \_ [ksoftirqd/4]
> root          25 99.9  0.0      0     0 ?        R    May29 1177:51  \_ [ksoftirqd/5]
> 
> From /proc/interrupts I can see that it's caused by IR-IO-APIC-edge      timer:
> 
>            CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7      
>   0:     136922     103603      26928      27528  112318229   71888343      73755     285735  IR-IO-APIC-edge      timer
> 
> kernel /vmlinuz-2.6.32-042stab138.1 ro root=UUID=7367aa0f-8216-44ca-9cc4-affed22bbd9c rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM nohz=off nopti
> 
> Any way to troubleshoot this? Is it a known issue?
> 
> Karl
> 
> 
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