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RHEL 5.6 and Interrrupts
I am trying to investigate if a machine is hitting its limit of interrupts.
I get the following :
Does this indicate a normal state (I am assming it does)
What would it look like if I had reached a state where I had too many interrupts which were slowing the machine down ?
I get the following :
[root@WEST5 ~]# ps -ef | grep ksoftirqd
root 3 1 0 May02 ? 00:00:00 [ksoftirqd/0]
root 6 1 0 May02 ? 00:00:00 [ksoftirqd/1]
root 9 1 0 May02 ? 00:00:00 [ksoftirqd/2]
root 12 1 0 May02 ? 00:00:00 [ksoftirqd/3]
root 15 1 0 May02 ? 00:00:00 [ksoftirqd/4]
root 18 1 0 May02 ? 00:00:00 [ksoftirqd/5]
root 21 1 0 May02 ? 00:00:00 [ksoftirqd/6]
root 24 1 0 May02 ? 00:00:00 [ksoftirqd/7]
root 27 1 0 May02 ? 00:00:00 [ksoftirqd/8]
root 30 1 0 May02 ? 00:00:00 [ksoftirqd/9]
root 33 1 0 May02 ? 00:00:00 [ksoftirqd/10]
root 36 1 0 May02 ? 00:00:00 [ksoftirqd/11]
root 39 1 0 May02 ? 00:00:00 [ksoftirqd/12]
root 42 1 0 May02 ? 00:00:00 [ksoftirqd/13]
root 45 1 0 May02 ? 00:00:00 [ksoftirqd/14]
root 48 1 0 May02 ? 00:00:00 [ksoftirqd/15]
root 51 1 0 May02 ? 00:00:00 [ksoftirqd/16]
root 54 1 0 May02 ? 00:00:00 [ksoftirqd/17]
root 57 1 0 May02 ? 00:00:00 [ksoftirqd/18]
root 60 1 0 May02 ? 00:00:00 [ksoftirqd/19]
root 63 1 0 May02 ? 00:00:00 [ksoftirqd/20]
root 66 1 0 May02 ? 00:00:00 [ksoftirqd/21]
root 69 1 0 May02 ? 00:00:00 [ksoftirqd/22]
root 72 1 0 May02 ? 00:00:00 [ksoftirqd/23]
root 12778 12715 0 11:21 pts/4 00:00:00 grep ksoftirqd
Does this indicate a normal state (I am assming it does)
What would it look like if I had reached a state where I had too many interrupts which were slowing the machine down ?
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Remediation:
cat /proc/interrupts to identify potential candidates for pinning tasks (taskset) and consider using isolcpus (isolcpus=4,5) in your system grub.conf with taskset to isolate CPUs for designated tasks.