[Users] NOHZ: local_softirq_pending 100

Gena Makhomed gmm at csdoc.com
Wed Dec 13 11:39:46 MSK 2017


Hello, All!

# uname -a
Linux hardware-node 2.6.32-042stab126.1 #1 SMP Wed Nov 15 20:14:46 MSK 
2017 x86_64 x86_64 x86_64 GNU/Linux

# grep NO_HZ /boot/config-$(uname -r)
CONFIG_NO_HZ=y

During backup of ploop containers via network:
https://openvz.org/Ploop/Backup#File-based_backup

I see in /var/log/messages file:
Dec 13 02:14:03 hardware-node kernel: [873287.257827] NOHZ: 
local_softirq_pending 100

Red Hat article https://access.redhat.com/solutions/62637 is closed,
so I see in internet recommendations add "nohz=off" to kernel boot line.

"Messages should disappear and it should improve performance a bit."
http://forum.odin.com/threads/nohz-local_softirq_pending-100.337205/

Linux Kernel Documentation:
https://www.kernel.org/doc/Documentation/timers/NO_HZ.txt

As I understand from Linux Kernel Documentation, "nohz=off" mode
will be good for heavy loaded OpenVZ servers, and error message
"NOHZ: local_softirq_pending 100" will disappear from log files.

But I can't find any information about
"NOHZ: local_softirq_pending 100" messages
on the main OpenVZ site https://openvz.org/

-- 
Best regards,
  Gena


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