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Subject: Re: userspace irq balancer
From: Arjan van de Ven <arjanv@redhat.com>
Reply-To: arjanv@redhat.com
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
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On Wed, 2003-05-21 at 18:31, James Bottomley wrote:
> I'm interested in using this for voyager.  However, I have a problem in
> that voyager may have CPUs that can't accept interrupts (this is global
> on voyager, but may be per-interrupt on NUMA like systems).  I think
> before we move to a userspace solution, some thought about how to cope
> with this is needed.
>=20
> I have several suggestions:
>=20
> 1. Place the masks into /proc/irq/<n>/smp_affinity at start of day and
> have the userspace irqbalancer take this as the maximal mask
>=20
> 2. Have a separate file /proc/irq/<n>/mask(?) to expose the mask always
>=20
> 3. Some other method...

I would prefer the second method.


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