Date: Fri, 18 Feb 2005 14:39:49 -0800
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Joerg Sommrey <jo@sommrey.de>,
       Linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Question on CONFIG_IRQBALANCE / 2.6.x
Message-ID: <4440000.1108766389@flay>
In-Reply-To: <20050218213332.GA13485@sommrey.de>
References: <20050218213332.GA13485@sommrey.de>
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> 
> there's something I don't understand:  With IRQBALANCE *enabled* almost
> all interrupts are processed on CPU0.  This changed in an unexpected way
> after disabling IRQBALANCE: now all interrupts are distributed uniformly
> to both CPUs.  Maybe it's intentional, but it's not what I expect when a
> config option named IRQBALANCE is *disabled*.
> 
> Can anybody comment on this?

If you have a Pentium 3 based system, by default they'll round robin.
If you turn on IRQbalance, they won't move until the traffic gets high
enough load to matter. That's presumably what you're seeing.

m.

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