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Re: _High_ CPU usage while routing (mostly) small UDP packets

To: Karsten Desler <kdesler@xxxxxxxxxx>, Robert Olsson <Robert.Olsson@xxxxxxxxxxx>
Subject: Re: _High_ CPU usage while routing (mostly) small UDP packets
From: jamal <hadi@xxxxxxxxxx>
Date: 07 Dec 2004 07:34:05 -0500
Cc: Bernd Eckenfels <ecki-news2004-05@xxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20041207102132.GA28588@xxxxxxxxxxxxxxxxxxxx>
Organization: jamalopolous
References: <20041206224107.GA8529@xxxxxxxxxx> <E1CbSf8-00047p-00@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20041207002012.GB30674@xxxxxxxxxxxxxxxxxxxx> <1102387595.1088.48.camel@xxxxxxxxxxxxxxxx> <20041207025456.GA525@xxxxxxxxxx> <1102389533.1089.51.camel@xxxxxxxxxxxxxxxx> <20041207032438.GA7767@xxxxxxxxxx> <1102390241.1093.59.camel@xxxxxxxxxxxxxxxx> <20041207040235.GA10501@xxxxxxxxxx> <20041207102132.GA28588@xxxxxxxxxxxxxxxxxxxx>
Reply-to: hadi@xxxxxxxxxx
Sender: netdev-bounce@xxxxxxxxxxx
On Tue, 2004-12-07 at 05:21, Karsten Desler wrote:

> But looking and the int/s number, I'm not so sure anymore. Is there any
> other way to find out?
> 

> # sar -I 169 5 5
> 11:20:05         INTR    intr/s
> 11:20:10          169  10401.40

That doesnt seem to be too high. 
You have a dual opteron 244. You are supposed to be kicking ass with
that machine - not 200Kpps+ you are getting with all that CPU overload.
Something is wrong with your setup. Unfortunately i cant afford such a
machine so i cant see it right off the bat. I know Robert has at least
one similar machine; maybe he could help. Robert?

cheers,
jamal 


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