linux-kernel - Re: [PATCH 00/10] interconnect: osm-l3: SC8280XP L3 and DDR scaling

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Date:   Fri, 28 Oct 2022 20:27:27 -0500
From:   Steev Klimaszewski <steev@...i.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Mike Tipton <quic_mdtipton@...cinc.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] interconnect: osm-l3: SC8280XP L3 and DDR scaling

On Thu, Oct 27, 2022 at 10:42 PM Bjorn Andersson
<quic_bjorande@...cinc.com> wrote:
>
> The SC8280XP currently shows depressing results in memory benchmarks.
> Fix this by introducing support for the platform in the OSM (and EPSS)
> L3 driver and support for the platform in the bwmon binding.
>
> Then add the necessary nodes and values throughout the sc8280xp and
> sa8540p dtsi files to make the various devices on these platforms scale
> both L3, memory bus and DDR.
>
> Bjorn Andersson (10):
>   interconnect: qcom: osm-l3: Use platform-independent node ids
>   interconnect: qcom: osm-l3: Squash common descriptors
>   interconnect: qcom: osm-l3: Add per-core EPSS L3 support
>   interconnect: qcom: osm-l3: Simplify osm_l3_set()
>   dt-bindings: interconnect: Add sm8350, sc8280xp and generic OSM L3
>     compatibles
>   arm64: dts: qcom: Align with generic osm-l3/epss-l3
>   arm64: dts: qcom: sc8280xp: Add epss_l3 node
>   arm64: dts: qcom: sc8280xp: Set up L3 scaling
>   dt-bindings: interconnect: qcom,msm8998-bwmon: Add sc8280xp bwmon
>     instances
>   arm64: dts: qcom: sc8280xp: Add bwmon instances
>
>  .../interconnect/qcom,msm8998-bwmon.yaml      |   5 +
>  .../bindings/interconnect/qcom,osm-l3.yaml    |  22 ++-
>  arch/arm64/boot/dts/qcom/sa8540p.dtsi         |  39 +++++
>  arch/arm64/boot/dts/qcom/sc7180.dtsi          |   2 +-
>  arch/arm64/boot/dts/qcom/sc7280.dtsi          |   2 +-
>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi        | 152 ++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sdm845.dtsi          |   2 +-
>  arch/arm64/boot/dts/qcom/sm8150.dtsi          |   2 +-
>  arch/arm64/boot/dts/qcom/sm8250.dtsi          |   2 +-
>  drivers/interconnect/qcom/osm-l3.c            | 126 ++++-----------
>  10 files changed, 251 insertions(+), 103 deletions(-)
>
> --
> 2.37.3
>
Prior to this series being applied:

steev@cho:~/temp/mybw$ ./mybw
    64: 21043.42MB/s
   128: 22511.90MB/s
   256: 23190.96MB/s
   512: 23532.00MB/s
  1024: 23537.36MB/s
    2K: 23730.19MB/s
    4K: 23307.45MB/s
    8K: 23603.36MB/s
   16K: 23752.39MB/s
   32K: 23819.91MB/s
   64K: 23871.28MB/s
  128K: 23890.10MB/s
  256K: 23851.90MB/s
  512K: 23759.65MB/s
 1024K: 15956.73MB/s
    2M: 8418.88MB/s
    4M: 6385.06MB/s
    8M: 5959.11MB/s
   16M: 5892.18MB/s
   32M: 6109.78MB/s


With this series applied:
steev@cho:~/temp/mybw$ ./mybw
    64: 21193.63MB/s
   128: 22513.64MB/s
   256: 23196.15MB/s
   512: 23554.33MB/s
  1024: 23555.31MB/s
    2K: 23738.53MB/s
    4K: 23310.13MB/s
    8K: 23616.14MB/s
   16K: 23768.47MB/s
   32K: 23847.16MB/s
   64K: 23881.61MB/s
  128K: 23901.33MB/s
  256K: 23910.21MB/s
  512K: 23839.70MB/s
 1024K: 23577.47MB/s
    2M: 23836.08MB/s
    4M: 23798.35MB/s
    8M: 23759.23MB/s
   16M: 22887.62MB/s
   32M: 22491.87MB/s

Additionally, if anyone is curious, geekbench 5.4 comparison, with
this patchset applied on 6.0.5:

https://browser.geekbench.com/v5/cpu/compare/18284519?baseline=18076980

This change is very welcomed :)

Tested on the Lenovo Thinkpad X13s

Tested-by: Steev Klimaszewski <steev@...i.org>