Willy Tarreau wrote:# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 342 261 258 278 271 253 264 283 IO-APIC-edge timer 1: 0 0 1 0 1 0 0 0 IO-APIC-edge i8042 6: 0 1 0 1 0 0 1 0 IO-APIC-edge floppy 9: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi 12: 1 1 0 0 0 1 1 0 IO-APIC-edge i8042 17: 180 190 178 183 182 186 186 188 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb4 18: 843504 842514 843653 842033 842416 842742 841903 842960 IO-APIC-fasteoi 3w-9xxx, uhci_hcd:usb3 19: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb2 498: 534642903 534635899 534726883 534732377 534701710 534708588 534730550 534742730 PCI-MSI-edge eth5 499: 531832274 531846609 531917849 531942676 531855140 531850692 531885565 531863468 PCI-MSI-edge eth4 500: 487251627 487279206 487248030 487220044 487239637 487231454 487281672 487227202 PCI-MSI-edge eth3 501: 486083953 486062203 486109925 486075793 486036977 486035152 486097551 486117164 PCI-MSI-edge eth2 502: 528889380 528863624 528760188 528798619 528891886 528890760 528807939 528822746 PCI-MSI-edge eth1 503: 529043135 529056706 528980250 528975209 529018995 529027386 528941583 528970472 PCI-MSI-edge eth0 NMI: 0 0 0 0 0 0 0 0 Non-maskable interrupts LOC: 62893699 62809502 62744208 62746035 62708815 62709055 62739182 62620363 Local timer interrupts RES: 15454866 15827970 16235695 15386970 15761053 16097167 16190851 16159843 Rescheduling interrupts CAL: 85 98 85 84 98 93 94 91 function call interrupts TLB: 3565361 3561798 3570271 3566272 3556996 3555866 3578257 3564557 TLB shootdowns TRM: 0 0 0 0 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 0 0 0 0 Threshold APIC interrupts SPU: 0 0 0 0 0 0 0 0 Spurious interrupts Yikes! all wrong! the network irq's are being ping-ponged around all the cores! bad! 1) turn the in-kernel IRQBALANCE option off ! 2) use either the userspace `irqbalance` daemon or 3) set smp_affinity manually Auke --
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