linux-kernel - Re: cpu load balancing problem on smp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200702061941.32907.donner@dbd-breitband.de>
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/