Subject: Re: interrupt rate from a NIC
To: Kamal R Prasad <>
From: Martin Husemann <>
List: tech-net
Date: 03/07/2003 08:56:32
On Fri, Mar 07, 2003 at 05:49:02AM +0000, Kamal R Prasad wrote:
>  I believe a DDoS     
>  (distributed denial  
>  of service attack    
>  can cause wire-speed 
>  traffic to come in   
>  from all over the    
>  net and cause a high 
>  interrupt rate even  
>  in non-promiscous    
>  mode.                

Depending on your value of wire-speed. Still unlikely to place unreasonable
interrupt load. Example: my slowest sparc64 machine, an Ultra 5 (270 MHz),
can perfectly cope with wire-speed of it's 100baseTX-fdx interface.

My even slower Sparc LX (32bit sparc v8 at 50MHz, IIRC) can not keep up
with that speed - so it drops packets. TCP handles this and scales down the
speed. No problem.

Ary you looking at some real problem or just making up theories?