Very High SoftIRQ in top output

nima0102 · 12-28-2010, 06:54 AM

Hi
In our server,top shows "si" with high number! softirq is very high on this server,approximate 90% on one core.
How can I determine reason of this problem?
Is there any way that I can determine cause of these softirq?what application or hardware generate these softirqs.

Thanks for any help or guidance

arfski · 12-30-2010, 04:41 AM

You don't say what distro or hardware you are using so not a lot to go on. Open up a terminal window and typing "sudo cat /proc/interrupts" will tell you what is doing what. It will certainly give you some better clues to go searching for, an errant module that could be blacklisted for example. Another possible catch all cure is to use "noapic" on your boot line but that is a bit of a hammer to crack a nut.