Greetings,
I have an appliance with 2 CPU cores and 3 network interfaces. In my case,
eth0/eth1 are on an i210 and eth2 is on i211. The first 2 interfaces
(eth0/eth1) are acting as a bridge, and eth2 is normal. I am using Linux
kernel 3.18.20 and igb 5.3.3.2.
I am hunting down performance delays when traffic from eth2 is passing
through the eth0/eth1 bridge. I notice that all interrupts from all
adapters are occurring on CPU 0. I suspect that I can get a performance
boost if I distribute my interrupts across both CPU cores (similar to my
ixgbe based appliances). Is this possible through some configuration or
minor driver changes?
Here is a summary of my interrupts and a sample of my CPU affinity:
----------------- cut ----------------
# cat /proc/interrupts
CPU0 CPU1
0: 50 0 IO-APIC-edge timer
1: 3 0 IO-APIC-edge i8042
4: 2205 0 IO-APIC-edge serial
8: 13 0 IO-APIC-fasteoi rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 5 0 IO-APIC-edge i8042
18: 0 0 IO-APIC 18-fasteoi i801_smbus
23: 87 0 IO-APIC 23-fasteoi ehci_hcd:usb1
87: 4 0 PCI-MSI-edge i915
88: 5790 0 PCI-MSI-edge 0000:00:13.0
89: 1 0 PCI-MSI-edge eth0
90: 13149 0 PCI-MSI-edge eth0-TxRx-0
91: 8221 0 PCI-MSI-edge eth0-TxRx-1
92: 1 0 PCI-MSI-edge eth1
93: 13379 0 PCI-MSI-edge eth1-TxRx-0
94: 8840 0 PCI-MSI-edge eth1-TxRx-1
95: 674 0 PCI-MSI-edge eth2
96: 11654 0 PCI-MSI-edge eth2-TxRx-0
97: 1674 0 PCI-MSI-edge eth2-TxRx-1
98: 64 0 PCI-MSI-edge iwlwifi
NMI: 3 3 Non-maskable interrupts
LOC: 295147 249655 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 3 3 Performance monitoring interrupts
IWI: 1 0 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 1916 2172 Rescheduling interrupts
CAL: 116 2390 Function call interrupts
TLB: 1340 1345 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 3 3 Machine check polls
HYP: 0 0 Hypervisor callback interrupts
ERR: 0
MIS: 0
# cat /proc/irq/90/smp_affinity
3
----------------- cut ----------------
--
*Fred Klassen*
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