High cpu interrrupt
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Hi, i have added a quad port fast ethernet card, this is the dmesg log:
pci3: <acpi pci="" bus="">on pcib3
sf0: <adaptec 10="" ana-62044="" 100basetx="">port 0xcc00-0xccff mem 0xf7f80000-0xf7ffffff irq 5 at device 4.0 on pci3
miibus1: <mii bus="">on sf0
ukphy0: <generic ieee="" 802.3u="" media="" interface="">on miibus1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sf0: Ethernet address: 00:00:d1:ed:66:7d
sf1: <adaptec 10="" ana-62044="" 100basetx="">port 0xc800-0xc8ff mem 0xf7f00000-0xf7f7ffff irq 5 at device 5.0 on pci3
miibus2: <mii bus="">on sf1
ukphy1: <generic ieee="" 802.3u="" media="" interface="">on miibus2
ukphy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sf1: Ethernet address: 00:00:d1:ed:66:7e
sf2: <adaptec 10="" ana-62044="" 100basetx="">port 0xc400-0xc4ff mem 0xf7e80000-0xf7efffff irq 5 at device 6.0 on pci3
miibus3: <mii bus="">on sf2
ukphy2: <generic ieee="" 802.3u="" media="" interface="">on miibus3
ukphy2: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sf2: Ethernet address: 00:00:d1:ed:66:7f
sf3: <adaptec 10="" ana-62044="" 100basetx="">port 0xc000-0xc0ff mem 0xf7e00000-0xf7e7ffff irq 10 at device 7.0 on pci3
miibus4: <mii bus="">on sf3
ukphy3: <generic ieee="" 802.3u="" media="" interface="">on miibus4
ukphy3: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sf3: Ethernet address: 00:00:d1:ed:66:80This was because i need to connect another 3 networks, after i enabled nat for each of them, the cpu interrrupt rate goes crazy, aroud 80% with peaks at 100%
Before it was at 15% - 25%, i didnt customize anything, just pluged in the card and confiured the aditional opt interfaces, did i miss something?
Regards</generic></mii></adaptec></generic></mii></adaptec></generic></mii></adaptec></generic></mii></adaptec></acpi> -
Is there traffic on these? If so, and if you're not running polling, I'd expect an increase in interrupts - you've just added 4 more devices that generate them after all!
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yes, there is 2-3 Mb in every one. So it is "normal", there is nothing i can do?
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Normal varies a lot - you've missed out just about all useful information to help define that, however…
Try enabling polling. It can hurt throughput, but it does reduce interrupts. You'd probably also find a better result with a better card, such as an Intel Server NIC.
