* IRQ and CPU Affinity
@ 2015-12-03 22:51 Angelo Brito
0 siblings, 0 replies; only message in thread
From: Angelo Brito @ 2015-12-03 22:51 UTC (permalink / raw)
Hello Gentlemen,
We had some problems with a controller and some commands were missing
(timeouts and cancelling I/O).
I noticed that some interruptions were handled by different CPUs, like
in this example:
[root at schenberg ~]# uname -a
Linux schenberg 4.3.0-1.el7.elrepo.x86_64 #1 SMP Tue Nov 3 20:15:39
EST 2015 x86_64 x86_64 x86_64 GNU/Linux
[root at schenberg ~]# cat /proc/interrupts | grep nvme
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5
CPU6 CPU7
38: 158075552 0 0 0 3 0
0 0 IR-PCI-MSI 524288-edge nvme0q0, nvme0q1
39: 0 155369176 0 0 0 0
0 0 IR-PCI-MSI 524289-edge nvme0q2
40: 0 0 166645563 0 0 0
0 0 IR-PCI-MSI 524290-edge nvme0q3
41: 0 0 0 185969937 0 0
0 0 IR-PCI-MSI 524291-edge nvme0q4
42: 1 0 0 0 91441357 1
0 0 IR-PCI-MSI 524292-edge nvme0q5
43: 0 0 0 0 0 92262534
0 0 IR-PCI-MSI 524293-edge nvme0q6
44: 0 0 0 0 0 0
96782665 0 IR-PCI-MSI 524294-edge nvme0q7
45: 0 0 0 0 0 0
0 79111494 IR-PCI-MSI 524295-edge nvme0q8
nvme0q0, nvme0q1 interrupted the host and CPU4 3 times and nvme0q5
interrupts were handled by CPU0, CPU4 and CPU5.
Is it a common behavior? Why would others CPU handles interrupts from
the not corresponding Completion Queue?
Regards,
Angelo Silva Brito.
http://about.me/angelobrito
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