I have 3 network interface cards in a linux router using version 2.6.12 of the kernel. I use two
interface cards for incoming traffic and one for outgoing traffic. The two cards used for incoming
traffic, eth1 and eth2, are 3com network cards that use the 3c59x driver. The card that is used for
outgoing traffic, eth0, uses the e1000 driver.
When there are two network interfaces mainly receiving packets and one mainly sending, will their
interrupt number affect the order packets are put into the queue for transmission?
The following is the output from /proc/interrupts
CPU0
0: 299823889 XT-PIC timer
1: 173520 XT-PIC i8042
2: 0 XT-PIC cascade
5: 126665 XT-PIC Intel ICH5
8: 58667 XT-PIC rtc
9: 22162271 XT-PIC acpi, ehci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb5,
i915@pci:0000:00:02.0, eth2
10: 46703995 XT-PIC libata, uhci_hcd:usb4, eth0
11: 44809773 XT-PIC uhci_hcd:usb3, eth1
12: 4199807 XT-PIC i8042
14: 547056 XT-PIC ide0
15: 2696779 XT-PIC ide1
NMI: 0
ERR: 0
Are interrupts prioritised ? ie if packets arrive at both eth1 and eth2 at the same time, will the
packets from eth2 be passed to upper layers first because it has a lower interrupt number?
I would really appreciate if someone could answer my question.
Jonathan Lynch
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