V7 High CPU Usage on swi5:+, what is this process?

Ivan Voras ivoras at freebsd.org
Mon Mar 17 18:44:31 UTC 2008

Aminuddin Abdullah wrote:
> I have just upgraded 5 of my machines to V7 from 6.3 and then realized that
> all the machines has a high CPU usage. Almost all of them using 80%-90% CPU
> with more than 8000 connections. Using previous 6.3, it only uses 40-50% CPU
> with the same kind of connections.
> Using top -S, I can see that swi5: +, PID 17 process is using 30% of CPU
> time. What is this process?  

"swi" stands for "software interrupt", but to find out which one you'll 
need to give more information about the systems. What are they running? 
Any routing, firewall? Check with "vmstat -ia" to see if you have an 
interrupt storm.

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