[Users] Lots of interrupts since latest el6 kernel

[Karl Johnson]

Hello,

It's always related to swapper and ksoftirqd:

Some examples here: https://pastebin.com/wn0nCwce

Karl

On Thu, May 30, 2019 at 3:11 PM Vasily Averin <vvs at virtuozzo.com> wrote:

> 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
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at openvz.org
> > https://lists.openvz.org/mailman/listinfo/users
> >
>
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