I have a server that's running CentOS release 4.7 (Final) with 2.6.9-67.ELsmp kernel. The CPU load keeps going up to 100% and causes the overall load average to go up. The process that does it seems to be ksoftirqd/0. I'm assuming that the /0 indicates it's on CPU0.
I took the following readings from /proc/interrupts exactly 10 seconds apart. Could someone please help me figure out what is causing the load to increase like that?
The server is used primarily as a web server and secondarily as a database server. It makes lots of HTTP and MySQL requests to other servers on the LAN. eth0 is LAN, eth1 is external internet.
If I omitted any crucial information, please let me know and I'll supply it if necessary. Thanks!
Code:
root@server [~]# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 18843906 18853057 18853075 18853148 18853261 18846028 18843150 18843251 IO-APIC-edge timer
8: 57 68 59 68 57 68 58 68 IO-APIC-edge rtc
9: 0 0 0 0 0 0 0 0 IO-APIC-level acpi
14: 5 35914 0 470168 844935 0 6 1080 IO-APIC-edge ide0
50: 1668752 0 0 0 0 0 0 0 PCI-MSI eth1
58: 7 0 59626 0 0 0 0 0 PCI-MSI eth2
177: 1 1 4 1 1 3 3 3 IO-APIC-level ehci_hcd, uhci_hcd, uhci_hcd
185: 0 0 0 0 0 0 0 0 IO-APIC-level uhci_hcd
209: 863 79254 724762 226505 209819 39466 15785 674279 IO-APIC-level megasas
233: 3598211 0 0 0 0 0 0 0 PCI-MSI eth0
NMI: 150789115 150789077 150789076 150789075 150789074 150789073 150789072 150789071
LOC: 150753434 150211845 150759372 150758021 150752539 150758684 150212279 150757728
ERR: 0
MIS: 0
root@server [~]# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 18843906 18853057 18853075 18853148 18853261 18852606 18844568 18843251 IO-APIC-edge timer
8: 57 68 59 68 57 68 58 68 IO-APIC-edge rtc
9: 0 0 0 0 0 0 0 0 IO-APIC-level acpi
14: 5 35914 0 470240 844935 0 6 1080 IO-APIC-edge ide0
50: 1668793 0 0 0 0 0 0 0 PCI-MSI eth1
58: 7 0 59629 0 0 0 0 0 PCI-MSI eth2
177: 1 1 4 1 1 3 3 3 IO-APIC-level ehci_hcd, uhci_hcd, uhci_hcd
185: 0 0 0 0 0 0 0 0 IO-APIC-level uhci_hcd
209: 863 79254 724762 226505 209820 39466 15785 674441 IO-APIC-level megasas
233: 3598227 0 0 0 0 0 0 0 PCI-MSI eth0
NMI: 150797111 150797073 150797072 150797071 150797070 150797069 150797068 150797067
LOC: 150761431 150219814 150767366 150766015 150760535 150766679 150220249 150765723
ERR: 0
MIS: 0
