throughput and interrupts

[Stanislaw Halik]

On Tue, Aug 15, 2006, Bachilo Dmitry wrote:
> I am completely stuck. I have a router, that rules three subnets. At first 
> there were Allied Telesyn's netcards with realtek chipsets. I am using 
> ipfw+natd and I had like 3,5 megabytes per second with 20 per cent of 
> interrupt load. [...]

> I just don't know what to try, to gain at least 9 mb/s, because this is what I 
> get at home with the same cards, the same processor, with no polling and 
> throgh the same provider.

Did you try using pf instead of ipfw+natd? natd is known to be
inefficient, as the kernel copies packets to and from the userland.

Not sure if this is the cause of your high interrupt load. What does
`top -S' show as the cpu-generating irq?

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