[LARTC] Dual CPU performance in routing

[LARTC] Dual CPU performance in routing

[GolemMTM]

Hello

I have question, currently using linux box as router. It only route packets.
Currently there is 80k packets/sec and this cause 90% CPU usage on
Intel Celeron 3ghz CPU.
Did multiprocessor system like 2x XEON DP 3.4ghz will divide CPU
usage between 2 CPU and will allow double routing performance ?


-- 
 Golem

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Re: [LARTC] Dual CPU performance in routing

[Dmytro O. Redchuk]

On Mon, Nov 06, 2006 at 10:53:25AM +0100, GolemMTM wrote:
> Hello
> 
> I have question, currently using linux box as router. It only route packets.
> Currently there is 80k packets/sec and this cause 90% CPU usage on
> Intel Celeron 3ghz CPU.
> Did multiprocessor system like 2x XEON DP 3.4ghz will divide CPU
> usage between 2 CPU and will allow double routing performance ?
If you have two physical eth cards and will assign different irq for
different CPU -- it will. Not sure about double, but significant, i'd say.

> 
> 
> -- 
>  Golem

-- 
  _,-=._              /|_/|
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        `    G.m-"^m`m'        Dmytro O. Redchuk

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Re: [LARTC] Dual CPU performance in routing

[Alexandru Dragoi]

GolemMTM wrote:
> Hello
>
> I have question, currently using linux box as router. It only route packets.
> Currently there is 80k packets/sec and this cause 90% CPU usage on
> Intel Celeron 3ghz CPU.
> Did multiprocessor system like 2x XEON DP 3.4ghz will divide CPU
> usage between 2 CPU and will allow double routing performance ?
>
>
>   
It will improve performance if irqs are balanced, but not double. Also, 
90% seems like a lot. If you use firewalling (many linear rules) and qos 
(many linear u32 filter rules), they will cost a lot of performance, you 
will se that with top, on soft interrupts (si). I suggest you to use 
intel gigabit cards on pci64.
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