[CentOS] kernel load 40-50%?

Peter Arremann loony at loonybin.org
Sat Nov 26 00:21:16 UTC 2005

On Friday 25 November 2005 02:31, Alberto wrote:
> Is there any command to view what kernel is doing when I have a high
> kernel/system load??

Unfortunately Linux has no real good way to determine that... Unless you got 
bad hardware (got any old qlogic fibre cards in your box by any change) there 
is most likely some process that is issueing a huge number of system calls. 
The other possibility is that some device causes a ton of interrupts. 

The system call stuff is more likely. I would start with top and look for the 
process that has the highest cpu utilization - system calls usually also have 
some from of processing in user mode. Then use strace -p <pid> to check the 
process... Anything up to few pages per process per second is normal and 
generates nowhere the system load you're seeing. Most likely you'll end up 
with a process that spins in a loop and does stuff like stat, accept or read 
over and over again.


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