Re: Linux based router for Gigabit traffic

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alex@pilosoft.com wrote:
> On Sun, 22 Aug 2004, Anantha Kiran wrote:
> > No, we are not using NAPI for this. But we wrote a net_hook
> > module which catches the pkts before allowing it to go upper
> > layers.
>
> You should use NAPI. Without NAPI, interrupt load will kill your
> machine.
>
> vmstat 1 -> if number of 'in' (interrupts) is more than 2000, you
> are not using NAPI.

Hmmmm. At first NAPI is used for Rx only in most of drivers AFAIK. 

And 2.4.26 kernel with e100 driver from http://sf.net/projects/e1000 
(3.0.17 if I remember correctly) CONFIG_E100_NAPI defined, router 
with two ethernet interfaces - forwarding ~15 kpps most of time, but 
I still see 30k interrupts from "vmstat 1" output. Am I doing 
something wrong?

-- 
Hasso Tepper
Elion Enterprises Ltd.
WAN administrator
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