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xen-devel
Re: [Xen-devel] Question Also regarding interrupt balancing
On 10 Jun 2006, at 17:58, harish wrote:
echo "2" > /proc/irq/23/smp_affinity does not seem to change the
value in smp_affinity
cat /proc/irq/23/smp_affinity still shows 0f
Could there some bug or configuration problem that you can think of?
It was a bug, which I've just fixed in -unstable and -testing staging
trees. When that reaches the public trees you should find that writing
to smp_affinity has the usual effect, but note:
1. As when running on native, a request to change affinity is not
processed until the next interrupt occurs for that irq. If the
interrupt rate on that irq is very low, you may be able to observe old
value in smp_affinity before it is changed.
2. You cannot change affinity of CPU-local interrupts (timer, resched,
callfunc). Requests to do so are silently ignored.
3. If you try to set a multi-cpu cpumask for affinity, it will be
changed to a single-cpu cpumask automatically. Linux-on-Xen does not
automatically balance irq load across cpus -- that has to be done by a
user-space daemon (e.g., irqbalance).
-- Keir
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