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Date: Tue, 6 Feb 2007 19:41:32 +0100 From: Marc Donner <donner@...-breitband.de> To: Arjan van de Ven <arjan@...ux.intel.com> Cc: linux-kernel@...r.kernel.org Subject: Re: cpu load balancing problem on smp On Tuesday 06 February 2007 19:09, you wrote: > 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 http://www.irqbalance.org to get irqbalance I now have tried irqloadbalance, but the same problem. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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