Re: Why does CPU utilization of various unrelated tasks increase in presence of network traffic?

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Hi guys....

> We faced similar kind of problem, we were trying to send the data
> using smtp protocol this involves creating a call to tmpfile(using
> with we used to create tmp file and give the file to the SMTP), bt
> the tmpfs  is of only 512 Kb so when ever tmp file reaches the 512 Kb
> or goes beyond that all the other irrelevant processes were showing
> huge increase in CPU utilization and the system used to crash.

It will be a good idea if you use oprofile or built-in profiling feature 
inside Linux kernel to find the hotspot. Then, based on the result, 
together we can find the root of the trouble. Also, please provide 
kernel version (+ patches, if any) you currently use.

Just a guess, maybe recently someone is increasing the number of softirq 
being processed inside interrupt handler path. So instead of passing 
them to ksoftirqd, more and more softirq is processed in the handler.

regards

Mulyadi


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