Hi, On 14-04-2015 13:04, Johan Kooijman wrote: > Hi, > > 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/ > http://pastebin.centos.org/23366/ > The 2nd paste was about 60 seconds after the first one. > > Am I missing something here? This is a brand new C7 installation: > > [root at 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! Is it really just because of networking? The counters didn't seem very high. You may watch /proc/softirqs for other sirqs too. Marcelo