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Date: Thu, 10 Jan 2008 15:26:59 +0000 From: Jeba Anandhan <jeba.anandhan@...oni.com> To: Eric Dumazet <dada1@...mosbay.com> Cc: netdev@...r.kernel.org, matthew.hattersley@...oni.com Subject: Re: SMP code / network stack 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: -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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