Hi Eric,
Thanks for the reply. I have one more doubt. For example, if we have 2
processor and 4 ethernet cards. Only CPU0 does all work through 8 cards.
If we set the affinity to each ethernet card as CPU number, will it be
efficient?.
Will this be default behavior?
# cat /proc/interrupts
CPU0 CPU1
0: 11472559 74291833 IO-APIC-edge timer
2: 0 0 XT-PIC cascade
8: 0 1 IO-APIC-edge rtc
81: 0 0 IO-APIC-level ohci_hcd
97: 1830022231 847 IO-APIC-level ehci_hcd, eth0
97: 3830012232 847 IO-APIC-level ehci_hcd, eth1
97: 5830052231 847 IO-APIC-level ehci_hcd, eth2
97: 6830032213 847 IO-APIC-level ehci_hcd, eth3
#sleep 10
# cat /proc/interrupts
CPU0 CPU1
0: 11472559 74291833 IO-APIC-edge timer
2: 0 0 XT-PIC cascade
8: 0 1 IO-APIC-edge rtc
81: 0 0 IO-APIC-level ohci_hcd
97: 2031409801 847 IO-APIC-level ehci_hcd, eth0
97: 4813981390 847 IO-APIC-level ehci_hcd, eth1
97: 7123982139 847 IO-APIC-level ehci_hcd, eth2
97: 8030193010 847 IO-APIC-level ehci_hcd, eth3
Instead of the above mentioned ,if we set the affinity for eth2 and
eth3.
the output will be
# cat /proc/interrupts
CPU0 CPU1
0: 11472559 74291833 IO-APIC-edge timer
2: 0 0 XT-PIC cascade
8: 0 1 IO-APIC-edge rtc
81: 0 0 IO-APIC-level ohci_hcd
97: 1830022231 847 IO-APIC-level ehci_hcd, eth0
97: 3830012232 847 IO-APIC-level ehci_hcd, eth1
97: 5830052231 923 IO-APIC-level ehci_hcd, eth2
97: 6830032213 1230 IO-APIC-level ehci_hcd, eth3
#sleep 10
# cat /proc/interrupts
CPU0 CPU1
0: 11472559 74291833 IO-APIC-edge timer
2: 0 0 XT-PIC cascade
8: 0 1 IO-APIC-edge rtc
81: 0 0 IO-APIC-level ohci_hcd
97: 2300022231 847 IO-APIC-level ehci_hcd, eth0
97: 4010212232 847 IO-APIC-level ehci_hcd, eth1
97: 5830052231 1847 IO-APIC-level ehci_hcd, eth2
97: 6830032213 2337 IO-APIC-level ehci_hcd, eth3
In this case, will the performance improves?.
Thanks
Jeba
On Thu, 2008-01-10 at 15:45 +0100, Eric Dumazet wrote:
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