Ksoftirqd / CentOS7

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Today I migrated a server form C6 to C7. The machine is dedicated for a couple of redis daemons. given the traffic etc, we see cpu0 being 100% in use immediately. No problem, had the same thing on the C6 server.

So I pinned certain processes/irq’s to other CPU’s and made irqbalance was monitoring things. That did solve the issue in C6, but not this time.

The links below contain the output of /proc/interrupts. As you can see CPU0
doesn’t seem that busy http://pastebin.CentOS.org/23361/
The 2nd paste was about 60 seconds after the first one.

Am I missing something here? This is a brand new C7 installation:

[root@redis1 ~]# uname -a Linux redis1.gamebasics.lan 3.10.0-229.1.2.el7.x86_64 #1 SMP Fri Mar 27
03:04:26 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Hardware is a brand new supermicro X9DRW board with onboard igb NIC’s in use.

Hope someone can help me!

One thought on - Ksoftirqd / CentOS7

  • Hi,

    Is it really just because of networking? The counters didn’t seem very high. You may watch /proc/softirqs for other sirqs too.