What does interrupt in eth0 mean?

I wonder if "Interrupt" affects internet connection.

eth0 Link encap:Ethernet HWaddr 60:eb:69:6c:55:83 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:45
eth1 Link encap:Ethernet HWaddr 4c:0f:6e:6c:d2:9f inet addr:192.168.11.41 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::4e0f:6eff:fe6c:d29f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:159717 errors:0 dropped:0 overruns:0 frame:24945 TX packets:155355 errors:40 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:224953980 (224.9 MB) TX bytes:13688161 (13.6 MB) Interrupt:17 

2 Answers

The interrupt refers to the interrupt number used by the network adapter. See the breakdown of ifconfig for more details.

Interrupt numbers are assigned to hardware devices by the kernel. They are used to multiplex the few interrupt channels that the CPU has between many hardware devices. You can see all interrupt numbers being used by executing cat /proc/interrupts/

In this case its most likely a dropped packet. Interrupts are how computers call fucntions at the CPU level. You load the registers and the stack and then generate an interrupt.
But if you really want to understand about interrupts, check out Wikipedia.

2

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