Troubleshooting High CPU Load¶
First, open a shell from SSH or the serial/VGA console (option
Typically one of these commands will include some obvious consumer of large amounts of system resources. For example, if the system CPU usage is high, it may be the packet filter. If a VPN process is using lots of CPU, the hardware may not be able to process more VPN traffic. If it is a NIC, see Hardware Tuning and Troubleshooting, etc.
If the solution is not obvious based on the output, post the collected information on the forum or contact support for further assistance.
View CPU Processes¶
To view the top processes, including interrupt processing CPU usage and system CPU:
View Interrupt Counters¶
To view the interrupt counters and other system usage:
systat -vmstat 1
View mbuf Usage¶
To view the mbuf usage:
Alternately, check the dashboard mbuf counter, and the graph under Status > Monitoring on the System tab.
View I/O Operations¶
To view I/O operations:
systat -iostat 1
m to switch to I/O mode to view disk activity.