AMD Publishes Platform QoS Patches For Next-Gen Processors
Written by Michael Larabel in AMD on 24 September 2018 at 07:03 PM EDT. 11 Comments
AMD --
This afternoon AMD sent out their first Linux kernel patches for what might end up being a new feature for the "EPYC 2" / Zen 2 processors.

Hitting the Linux kernel mailing list a few minutes ago was a set of experimental / request-for-comments patches on "AMD QoS support".
This series adds support for AMD64 architectural extensions for Platform Quality of Service. These extensions are intended to provide for the monitoring of the usage of certain system resources by one or more processors and for the separate allocation and enforcement of limits on the use of certain system resources by one or more processors.

The monitoring and enforcement are not necessarily applied across the entire system, but in general apply to a QOS domain which corresponds to some shared system resource.

The initial QoS functionality is for L3 cache allocation enforcement, L3 cache occupancy monitoring, L3 code-data prioritization, and memory bandwidth enforcement/allocation. This AMD QoS sounds like -- and implied as much by the Linux code -- akin to Intel RDT (Resource Director Technology).


The AMD Linux developer notes did say that this QoS functionality is for their "next generation of processors." That would be Zen 2 or more specifically likely reserved just for the "EPYC 2" server processors as I doubt we'll end up seeing this QoS functionality enabled for desktop Ryzen CPUs.

The initial patches for this support can be found on the kernel mailing list. In my close monitoring of the Linux kernel mailing list and my various automated detectors to note potentially interesting patches/commits, I believe this is the first of seeing any what is likely next-gen EPYC patches for the Linux kernel... It will certainly be interesting to see what else is on approach for the kernel in the near future as AMD gears up for a very interesting 2019.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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