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SubjectRe: [PATCH V4 0/7] x86/intel_rdt: Intel Cache Allocation Technology

* Luck, Tony <tony.luck@intel.com> wrote:

> > The CAT thing was annoying already, but at least one
> > can find that in the SDM, this RDT thing, not a single
> > mention.
>
> The problems of development at the bleeding edge. Would
> you rather Linux sat on the sidelines until there are
> enough Google hits from other users of new features?

Well, we'd prefer there to be A) published documentation,
or, lacking published documentation, there be B) a coherent
technical description within the code itself what the
purpose is and how it all works conceptually (minus the
buzzwords), so that we have a common starting point when
reviewing it.

> Technology: Intel Resource Director Technology
>
> Description: Allows the hypervisor to monitor Last Level Cache usage at the application
> and VM levels.
>
> Benefit: Helps to improve performance and efficiency by providing better
> information for scheduling, load balancing, and workload migration
>
> Which isn't any help in evaluating this patch series :-(

No, but it already tells us more than the 0/7 description
of the patch series did! It should be possible to improve
on that.

Maintainers reverse engineering the implementation is an
inefficient approach.

Thanks,

Ingo


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