linux-kernel - [RFC] export irq_set/get_affinity() for multiqueue network drivers

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Message-ID: <48B708E1.4070001@inria.fr>
Date:	Thu, 28 Aug 2008 22:21:53 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	netdev@...r.kernel.org
Subject: [RFC] export irq_set/get_affinity() for multiqueue network drivers

Hello,

Is there any way to setup IRQ masks from within a driver? myri10ge
currently relies on an external script (writing in
/proc/irq/*/smp_affinity) to bind each queue/MSI-X to a different
processor. By default, Linux will either:
* round-robin the interrupts (killing the benefit of DCA for instance)
* put all IRQs on the same CPU (killing much of the benefit of multislices)

With more and more drivers using multiqueues, I think we need a nice way
to bind MSI-X from within the drivers. I am not sure what's best, the
attached (untested) patch would just export the existing
irq_set_affinity() and add irq_get_affinity(). Comments?

thanks,
Brice

View attachment "export_irq_affinity.patch" of type "text/x-patch" (1805 bytes)