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Date: Mon, 23 Nov 2009 15:32:57 +0800 From: Yong Zhang <yong.zhang0@...il.com> To: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> Cc: linux-kernel@...r.kernel.org, arjan@...ux.jf.intel.com, davem@...emloft.net, netdev@...r.kernel.org Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints On Mon, Nov 23, 2009 at 2:46 PM, Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> wrote: > This patchset adds a new CPU mask for SMP systems to the irq_desc > struct. It also exposes an API for underlying device drivers to > assist irqbalance in making smarter decisions when balancing, especially > in a NUMA environment. For example, an ethernet driver with MSI-X may > wish to limit the CPUs that an interrupt can be balanced within to > stay on a single NUMA node. Current irqbalance operation can move the > interrupt off the node, resulting in cross-node memory accesses and > locks. > > The API is a get/set API within the kernel, along with a /proc entry > for the interrupt. > > Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> > --- 1) I think you should consider CONFIG_CPUMASK_OFFSTACK which will affect node_affinity. 2) It seems like this patch can't work with SPARSE_IRQ. Thanks, Yong -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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