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SubjectRe: [PATCH v6] x86/apic: limit irq affinity
On Fri, Dec 04, 2009 at 03:12:14PM -0800, Eric W. Biederman wrote:
> Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> writes:
>
> >> > > As a matter of fact, driver's allocating rings, buffers, queues on other nodes should optimally be made aware of the restriction.
> >> >
> >> > The idea is that the driver will do its memory allocations for everything
> >> > across nodes. When it does that, it will use the kernel interface
> >> > (function call) to set the corresponding mask it wants for those queue
> >> > resources. That is my end-goal for this code.
> >> >
> >>
> >> OK, but we will eventually have to reject any irqbalance attempts to send irqs to restricted nodes.
> >
> > See above.
>
> Either I am parsing this conversation wrong or there is a strong
> reality distortion field in place. It appears you are asking that we
> depend on a user space application to not attempt the physically
> impossible, when we could just as easily ignore or report -EINVAL to.
>
> We really have two separate problems hear.
> - How to avoid the impossible.

The kernel does need to restrict attempts at the impossible. However I see
nothing wrong with providing apps with information as to what the impossible
actually is.

> - How to deal with NUMA affinity.


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