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Message-Id: <1259054122.2631.31.camel@ppwaskie-mobl2>
Date: Tue, 24 Nov 2009 01:15:22 -0800
From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Yong Zhang <yong.zhang0@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"arjan@...ux.jf.intel.com" <arjan@...ux.jf.intel.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter
irqbalance hints
On Tue, 2009-11-24 at 02:08 -0700, Peter Zijlstra wrote:
> On Tue, 2009-11-24 at 00:59 -0800, Peter P Waskiewicz Jr wrote:
> > > This all sounds backwards.. we've got a perfectly functional interface
> > > for affinity -- which people object to being used for some reason. So
> > > you add another interface on top, and that is ok?
> > >
> >
> > But it's not functional. If I set the affinity in smp_affinity, then
> > irqbalance will override it 10 seconds later.
>
> And here I was thinking the kernel round-robins IRQ delivery on the mask
> specified there. Are you talking about some daft userspace thing that
> writes into the irq smp_affinity to effect irq balancing?
>
Yep. That's exactly what irqbalance does.
Cheers,
-PJ
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