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SubjectRe: [2.6.36.1] IGB driver handles all ethX interrupts on single cpu core.
Date
On Wednesday 08 of December 2010 02:44:25 Robert Hancock wrote:
> On 12/07/2010 12:06 PM, Paweł Sikora wrote:
> > hi,
> >
> > i'm currently testing a new server with 2x opteron-6128 with dual gigabit port
> > and observing that the igb driver uses only single core for all ethX interrupts.
> > is it a correct behaviour for this driver?
> >
> > BR,
> > Pawel.
>
> The CPU affinity for the IRQ isn't really under the driver's control. It
> looks like all your interrupts are being handled on CPU0. You likely
> need to run the irqbalance daemon.

ok, so why e.g. on one machine (dual amd opteron) irqbalance daemon is required
and on second machine (single intel quad-core) irqs are balanced w/o daemon?
this looks inconsistent to me.

$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 49 2 0 0 IO-APIC-edge timer
1: 0 1 0 1 IO-APIC-edge i8042
8: 13 11 12 13 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 0 0 3 1 IO-APIC-edge i8042
16: 224 236 235 232 IO-APIC-fasteoi pata_marvell, uhci_hcd:usb3
17: 0 0 0 0 IO-APIC-fasteoi saa7133[0], saa7133[0]
18: 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb8
19: 695 672 660 630 IO-APIC-fasteoi uhci_hcd:usb7
21: 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb4
23: 1 1 1 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
40: 3409 3446 3441 3403 PCI-MSI-edge ahci
41: 63 60 60 61 PCI-MSI-edge hda_intel
42: 3219 3180 3237 3192 PCI-MSI-edge radeon
43: 505 487 496 498 PCI-MSI-edge eth0
NMI: 11 7 12 8 Non-maskable interrupts
LOC: 14822 15293 17577 14404 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 11 7 12 8 Performance monitoring interrupts
PND: 0 0 0 0 Performance pending work
RES: 493 498 525 495 Rescheduling interrupts
CAL: 3975 248 2729 299 Function call interrupts
TLB: 937 1727 913 1600 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 2 2 2 2 Machine check polls
ERR: 3
MIS: 0
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