* IRQ mismatch ifconfig and /proc/interrupts
@ 2014-07-25 13:58 Oscar Salvador
2014-07-31 1:11 ` Peter Teoh
0 siblings, 1 reply; 2+ messages in thread
From: Oscar Salvador @ 2014-07-25 13:58 UTC (permalink / raw)
To: kernelnewbies
Hi People! How are you doing?
I'm writting to you because I have a doubt about interrupts.
If I look the interrupts assigned to my eth* with ifconfig, I get:
eth0 Link encap:Ethernet HWaddr bb:aa:bb:bb:aa:aa
Interrupt:20 Memory:f7e00000-f7e20000
eth1 Link encap:Ethernet HWaddr bb:aa:bb:bb:aa:aa
Interrupt:18 Memory:f7d00000-f7d20000
As you can see, my system assigned IRQ-20 and IRQ-18 to eth0 and eth1.
But If i look into /proc/interrupts, I don't have these interrupts:
root at oscar:/home/oscar# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 15 0 0 0 0 0 0 0 IR-IO-APIC-edge timer
8: 0 1 0 0 0 0 0 0 IR-IO-APIC-edge rtc0
9: 0 0 0 0 0 2 1 0 IR-IO-APIC-fasteoi acpi
16: 191342 27819 25143 21231 19007 18159 17183 15717 IR-IO-APIC-fasteoi ehci_hcd:usb3
19: 15 7 0 0 2 9 1 4 IR-IO-APIC-fasteoi firewire_ohci
23: 1441 76 61 42 101 55 29 23 IR-IO-APIC-fasteoi ehci_hcd:usb4
40: 0 0 0 0 0 0 0 0 DMAR_MSI-edge dmar0
41: 0 0 0 0 0 0 0 0 DMAR_MSI-edge dmar1
42: 0 0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
43: 27318 1788 1314 1414 4046 2273 2232 2059 IR-PCI-MSI-edge eth0
44: 115244 14686 10096 8738 41559 16021 10972 10090 IR-PCI-MSI-edge ahci
45: 197010 19487 45260 14687 43697 29520 24546 21590 IR-PCI-MSI-edge eth1-rx-0
46: 27239 20276 18861 14845 54218 17950 12907 9765 IR-PCI-MSI-edge eth1-tx-0
47: 0 0 1 0 0 0 0 1 IR-PCI-MSI-edge eth1
48: 262 150 78 60 261 249 168 47 IR-PCI-MSI-edge snd_hda_intel
49: 857324 80338 67789 59555 682632 90385 78616 65048 IR-PCI-MSI-edge i915
As you can see, seems to be that eth1 has IRQ-45 IRQ-46 and IRQ-47, and eth0 has IRQ-43.
I don't understand why ifconfig shows another IRQ.
Is this a normal behaviour? Someone would be so kind to explain me this?
Or maybe throw me some paper that explains this.
thank you very much
Best Regards
Oscar
^ permalink raw reply [flat|nested] 2+ messages in thread* IRQ mismatch ifconfig and /proc/interrupts
2014-07-25 13:58 IRQ mismatch ifconfig and /proc/interrupts Oscar Salvador
@ 2014-07-31 1:11 ` Peter Teoh
0 siblings, 0 replies; 2+ messages in thread
From: Peter Teoh @ 2014-07-31 1:11 UTC (permalink / raw)
To: kernelnewbies
I suspect it is a bug, mine is Ubuntu 3.2.0-32 pae kernel, 12.04 32-bit:
cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
41: 0 0 0 0 PCI-MSI-edge eth0
eth0 Link encap:Ethernet HWaddr 5c:f9:dd:75:54:d8
Interrupt:41 Base address:0x8000
everything matched.
On Fri, Jul 25, 2014 at 9:58 PM, Oscar Salvador <
osalvador.vilardaga@gmail.com> wrote:
> Hi People! How are you doing?
>
> I'm writting to you because I have a doubt about interrupts.
>
> If I look the interrupts assigned to my eth* with ifconfig, I get:
>
> eth0 Link encap:Ethernet HWaddr bb:aa:bb:bb:aa:aa
> Interrupt:20 Memory:f7e00000-f7e20000
>
> eth1 Link encap:Ethernet HWaddr bb:aa:bb:bb:aa:aa
> Interrupt:18 Memory:f7d00000-f7d20000
>
> As you can see, my system assigned IRQ-20 and IRQ-18 to eth0 and eth1.
>
> But If i look into /proc/interrupts, I don't have these interrupts:
>
> root at oscar:/home/oscar# cat /proc/interrupts
> CPU0 CPU1 CPU2 CPU3 CPU4 CPU5
> CPU6 CPU7
> 0: 15 0 0 0 0 0
> 0 0 IR-IO-APIC-edge timer
> 8: 0 1 0 0 0 0
> 0 0 IR-IO-APIC-edge rtc0
> 9: 0 0 0 0 0 2
> 1 0 IR-IO-APIC-fasteoi acpi
> 16: 191342 27819 25143 21231 19007 18159
> 17183 15717 IR-IO-APIC-fasteoi ehci_hcd:usb3
> 19: 15 7 0 0 2 9
> 1 4 IR-IO-APIC-fasteoi firewire_ohci
> 23: 1441 76 61 42 101 55
> 29 23 IR-IO-APIC-fasteoi ehci_hcd:usb4
> 40: 0 0 0 0 0 0
> 0 0 DMAR_MSI-edge dmar0
> 41: 0 0 0 0 0 0
> 0 0 DMAR_MSI-edge dmar1
> 42: 0 0 0 0 0 0
> 0 0 IR-PCI-MSI-edge xhci_hcd
> 43: 27318 1788 1314 1414 4046 2273
> 2232 2059 IR-PCI-MSI-edge eth0
> 44: 115244 14686 10096 8738 41559 16021
> 10972 10090 IR-PCI-MSI-edge ahci
> 45: 197010 19487 45260 14687 43697 29520
> 24546 21590 IR-PCI-MSI-edge eth1-rx-0
> 46: 27239 20276 18861 14845 54218 17950
> 12907 9765 IR-PCI-MSI-edge eth1-tx-0
> 47: 0 0 1 0 0 0
> 0 1 IR-PCI-MSI-edge eth1
> 48: 262 150 78 60 261 249
> 168 47 IR-PCI-MSI-edge snd_hda_intel
> 49: 857324 80338 67789 59555 682632 90385
> 78616 65048 IR-PCI-MSI-edge i915
>
>
> As you can see, seems to be that eth1 has IRQ-45 IRQ-46 and IRQ-47, and
> eth0 has IRQ-43.
> I don't understand why ifconfig shows another IRQ.
>
> Is this a normal behaviour? Someone would be so kind to explain me this?
>
> Or maybe throw me some paper that explains this.
>
> thank you very much
> Best Regards
>
> Oscar
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
--
Regards,
Peter Teoh
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2014-07-31 1:11 ` Peter Teoh
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