From: Joerg Sommrey <jo@sommrey.de>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Question on CONFIG_IRQBALANCE / 2.6.x
Date: Fri, 18 Feb 2005 23:57:22 +0100 [thread overview]
Message-ID: <20050218225722.GA11292@sommrey.de> (raw)
In-Reply-To: <4440000.1108766389@flay>
On Fri, Feb 18, 2005 at 02:39:49PM -0800, Martin J. Bligh wrote:
> >
> > 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.
It's an Athlon box that propably has the same behaviour. Just another
question on this topic: with IRQBALANCE enabled, almost all interupts
are routet to CPU0. Lately irq 0 runs on CPU1 and never returns to CPU0
- is there any obvious reason for that?
-jo
--
-rw-r--r-- 1 jo users 63 2005-02-18 23:29 /home/jo/.signature
next prev parent reply other threads:[~2005-02-18 22:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-18 21:33 Question on CONFIG_IRQBALANCE / 2.6.x Joerg Sommrey
2005-02-18 22:39 ` Martin J. Bligh
2005-02-18 22:57 ` Joerg Sommrey [this message]
2005-02-18 23:11 ` Jeff Garzik
2005-02-20 14:41 ` Martin J. Bligh
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