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From: Arjan van de Ven <>
To: Marc Donner <>
Subject: Re: cpu load balancing problem on smp
Date: Tue, 06 Feb 2007 19:09:24 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 2007-02-06 at 18:32 +0100, Marc Donner wrote:
> Hi @all
> we have detected some problems on our live systems and so i have build a test 
> setup in our lab as follow:
> 3 Core 2 duo servers, each with 2 CPUs,  with GE interfaces. 2 of them are 
> only for generating network traffic. the 3rd server is the one i want to 
> test. it is connected over two GE links to the other servers. the testserver 
> is configured as an ip router. running kernel 2.6.20. 
> now if i  let traffic flow over the box, about 600Mbit/s and about 120k 
> packets/s all seems to be ok. the load is balanced over all cpus. if now 
> insert some iptables rules, about 500, the softirq load increases, but all 
> seems to be ok. now i insert some rules more, and suddenly 1 CPU is 100% 
> loaded and the other ones are 99% idle. the load toggles now between the cpus 
> in intervals.

I wonder if you are using irqbalance.. if not you probably want to...
(this should at least split it over 2 cpus)

see to get irqbalance

  reply	other threads:[~2007-02-06 18:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06 17:32 Marc Donner
2007-02-06 18:09 ` Arjan van de Ven [this message]
2007-02-06 18:41   ` Marc Donner
2007-02-06 18:42     ` Arjan van de Ven
2007-02-06 19:57       ` Pablo Sebastian Greco
2007-02-06 20:12         ` Arjan van de Ven
2007-02-06 20:52           ` Pablo Sebastian Greco
2007-02-06 23:49       ` Marc Donner
2007-02-07  5:59         ` Arjan van de Ven
2007-02-07 21:32           ` Marc Donner
2007-02-08  8:42           ` David Lang
2007-02-09 15:12             ` Marc Donner

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