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

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Message-ID: <1259053736.4531.1097.camel@laptop>
Date:	Tue, 24 Nov 2009 10:08:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
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 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?

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