wenji
July 9, 2014, 2:45am
#1
Dear all,
I have an Mellanox 40G Ethernet NIC install in a Linux system. The NIC is configured as “Eth2”
I run “cat /proc/interrupts” to see the NIC’s interrupts, got the following results:
"
0 PCI-MSI-edge mlx4-comp-0@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-comp-1@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-comp-2@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-async@pci:0000:05:00.0
0 PCI-MSI-edge eth2-0
0 PCI-MSI-edge eth2-1
0 PCI-MSI-edge eth2-2
…
"
I understand that interrupt “eth2-x” represent the NIC has multiple receive queues, and each queue generates its own interrupts.
I do not understand is what do “mlx4-comp-x…” and “mlx4-async…” stand for, what kind of interrupts are these?
thanks
wenji
wenji
August 4, 2014, 11:27pm
#2
No,
I mean what these types of irqs means:
0 PCI-MSI-edge mlx4-comp-0@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-comp-1@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-comp-2@pci:0000:05:00.0
0 PCI-MSI-edge mlx4-async@pci:0000:05:00.0
I understand the following irqs are generated for each tx/rx queue for each cpu:
0 PCI-MSI-edge eth2-0
0 PCI-MSI-edge eth2-1
0 PCI-MSI-edge eth2-2
….
erezf
July 16, 2014, 9:44am
#3
Hello,
I believe these are irqs created by the mlx4 driver per CPU for rx/tx for each port and are automatically set if you have enabled the “affinty tuner” in the mlnx driver - /etc/infiniband/openib.conf
Otherwise irqs can be manually controlled by the set_irq_affinty script that comes with the MLNX bundle. you can read more about it in here :
http://www.mellanox.com/related-docs/prod_software/Performance_Tuning_Guide_for_Mellanox_Network_Adapters.pdf http://www.mellanox.com/related-docs/prod_software/Performance_Tuning_Guide_for_Mellanox_Network_Adapters.pdf