netdev - Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints

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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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