docs/perf/psci-performance-n1sdp.rst

Runtime Instrumentation Testing - N1SDP
=======================================

For this test we used the N1 System Development Platform (`N1SDP`_), which
contains an SoC consisting of two dual-core Arm N1 clusters.

The following source trees were used:

- `TF-A v2.13-rc0`_
- `TFTF v2.13-rc0`_

Please see the Runtime Instrumentation :ref:`Testing Methodology
<Runtime Instrumentation Methodology>` page for more details. The tests were ran
using the
`tf-psci-lava-instr/n1sdp-runtime-instrumentation,n1sdp-runtime-instrumentation:n1sdp-fip.tftf-firmware`
configuration in CI.

Results
-------

``CPU_SUSPEND`` to deepest power level
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in parallel (v2.13)

    +---------+------+----------------+-----------------+----------------+
    | Cluster | Core |   Powerdown    |      Wakeup     |  Cache Flush   |
    +---------+------+----------------+-----------------+----------------+
    |    0    |  0   |      3.32      | 13.42 (-45.40%) | 0.28 (-69.57%) |
    +---------+------+----------------+-----------------+----------------+
    |    0    |  0   | 4.02 (-35.78%) | 18.14 (-52.88%) |      0.28      |
    +---------+------+----------------+-----------------+----------------+
    |    1    |  0   | 2.7 (-27.42%)  | 17.38 (-49.36%) |      0.26      |
    +---------+------+----------------+-----------------+----------------+
    |    1    |  0   |      2.96      | 10.86 (-73.64%) |      0.26      |
    +---------+------+----------------+-----------------+----------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in parallel (v2.12)

    +---------+------+----------------+--------+----------------+
    | Cluster | Core |   Powerdown    | Wakeup |  Cache Flush   |
    +---------+------+----------------+--------+----------------+
    |    0    |  0   |      2.58      | 24.14  | 0.28 (-69.57%) |
    +---------+------+----------------+--------+----------------+
    |    0    |  0   | 4.24 (-32.27%) |  40.1  |      0.3       |
    +---------+------+----------------+--------+----------------+
    |    1    |  0   |      3.58      | 35.54  |      0.28      |
    +---------+------+----------------+--------+----------------+
    |    1    |  0   |      3.28      | 42.36  |      0.3       |
    +---------+------+----------------+--------+----------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in serial (v2.13)

    +---------+------+-----------+-----------------+----------------+
    | Cluster | Core | Powerdown |      Wakeup     |  Cache Flush   |
    +---------+------+-----------+-----------------+----------------+
    |    0    |  0   |    1.62   | 10.14 (-58.10%) |      0.3       |
    +---------+------+-----------+-----------------+----------------+
    |    0    |  0   |    1.86   | 10.62 (-56.44%) | 0.28 (-26.32%) |
    +---------+------+-----------+-----------------+----------------+
    |    1    |  0   |    1.8    | 10.16 (-57.84%) |      0.32      |
    +---------+------+-----------+-----------------+----------------+
    |    1    |  0   |    2.16   |  10.6 (-56.84%) | 0.5 (+56.25%)  |
    +---------+------+-----------+-----------------+----------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in serial (v2.12)

    +---------+------+-----------+--------+-------------+
    | Cluster | Core | Powerdown | Wakeup | Cache Flush |
    +---------+------+-----------+--------+-------------+
    |    0    |  0   |    1.9    |  23.8  |     0.36    |
    +---------+------+-----------+--------+-------------+
    |    0    |  0   |    2.26   | 23.86  |     0.34    |
    +---------+------+-----------+--------+-------------+
    |    1    |  0   |    2.02   |  23.4  |     0.36    |
    +---------+------+-----------+--------+-------------+
    |    1    |  0   |    2.24   | 23.84  |     0.36    |
    +---------+------+-----------+--------+-------------+

``CPU_SUSPEND`` to power level 0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in parallel (v2.13)

    +---------+------+----------------+-----------------+---------------+
    | Cluster | Core |   Powerdown    |      Wakeup     |  Cache Flush  |
    +---------+------+----------------+-----------------+---------------+
    |    0    |  0   | 0.8 (-57.45%)  | 11.98 (-61.75%) |      0.26     |
    +---------+------+----------------+-----------------+---------------+
    |    0    |  0   | 1.54 (-30.63%) | 16.44 (-53.74%) |      0.26     |
    +---------+------+----------------+-----------------+---------------+
    |    1    |  0   | 1.62 (-30.77%) |  16.1 (-53.92%) |      0.3      |
    +---------+------+----------------+-----------------+---------------+
    |    1    |  0   |      1.8       | 10.54 (-55.30%) | 0.2 (-33.33%) |
    +---------+------+----------------+-----------------+---------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in parallel (v2.12)

    +---------+------+-----------+--------+----------------+
    | Cluster | Core | Powerdown | Wakeup |  Cache Flush   |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |    1.46   |  31.7  |      0.32      |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |    2.06   |  35.5  | 0.48 (+60.00%) |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |    1.96   |  35.7  |      0.32      |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |    2.08   | 23.38  |      0.28      |
    +---------+------+-----------+--------+----------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in serial (v2.13)

    +---------+------+----------------+-----------------+----------------+
    | Cluster | Core |   Powerdown    |      Wakeup     |  Cache Flush   |
    +---------+------+----------------+-----------------+----------------+
    |    0    |  0   |      1.44      |  9.9 (-58.05%)  |      0.3       |
    +---------+------+----------------+-----------------+----------------+
    |    0    |  0   | 1.74 (-25.64%) |  10.4 (-56.23%) | 0.28 (-33.33%) |
    +---------+------+----------------+-----------------+----------------+
    |    1    |  0   |      1.8       | 10.04 (-57.71%) |      0.34      |
    +---------+------+----------------+-----------------+----------------+
    |    1    |  0   |      1.96      | 10.46 (-56.23%) |      0.44      |
    +---------+------+----------------+-----------------+----------------+

.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in serial (v2.12)

    +---------+------+-----------+--------+----------------+
    | Cluster | Core | Powerdown | Wakeup |  Cache Flush   |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |    1.66   | 23.22  |      0.36      |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |    2.58   | 23.72  | 0.78 (+85.71%) |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |    2.02   | 23.84  |      0.38      |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |    2.16   | 23.92  |      0.34      |
    +---------+------+-----------+--------+----------------+

``CPU_OFF`` on all non-lead CPUs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

``CPU_OFF`` on all non-lead CPUs in sequence then, ``CPU_SUSPEND`` on the lead
core to the deepest power level.

.. table:: ``CPU_OFF`` latencies (µs) on all non-lead CPUs (v2.13)

    +---------+------+-----------+-----------------+---------------+
    | Cluster | Core | Powerdown |      Wakeup     |  Cache Flush  |
    +---------+------+-----------+-----------------+---------------+
    |    0    |  0   |    1.64   | 10.24 (-57.72%) |      0.3      |
    +---------+------+-----------+-----------------+---------------+
    |    0    |  0   |   13.92   |  17.7 (-43.74%) |      0.3      |
    +---------+------+-----------+-----------------+---------------+
    |    1    |  0   |   13.54   | 16.74 (-44.90%) | 0.3 (-37.50%) |
    +---------+------+-----------+-----------------+---------------+
    |    1    |  0   |   14.12   | 18.28 (-41.93%) | 0.3 (-44.44%) |
    +---------+------+-----------+-----------------+---------------+

.. table:: ``CPU_OFF`` latencies (µs) on all non-lead CPUs (v2.12)

    +---------+------+-----------+--------+----------------+
    | Cluster | Core | Powerdown | Wakeup |  Cache Flush   |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |    1.84   | 23.82  |      0.36      |
    +---------+------+-----------+--------+----------------+
    |    0    |  0   |   14.18   | 31.78  | 0.56 (+86.67%) |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |   13.64   | 30.54  |      0.36      |
    +---------+------+-----------+--------+----------------+
    |    1    |  0   |   14.18   | 31.82  |      0.68      |
    +---------+------+-----------+--------+----------------+

``CPU_VERSION`` in parallel
~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. table:: ``CPU_VERSION`` latency (µs) in parallel on all cores (v2.13)

    +----------+------+-------------------+
    | Cluster  | Core |      Latency      |
    +----------+------+-------------------+
    |    0     |  0   |        0.12       |
    +----------+------+-------------------+
    |    0     |  0   |   0.2 (-28.57%)   |
    +----------+------+-------------------+
    |    1     |  0   |        0.2        |
    +----------+------+-------------------+
    |    1     |  0   |   0.24 (-25.00%)  |
    +----------+------+-------------------+

.. table:: ``CPU_VERSION`` latency (µs) in parallel on all cores (v2.12)

    +----------+------+-------------------+
    | Cluster  | Core |      Latency      |
    +----------+------+-------------------+
    |    0     |  0   |        0.14       |
    +----------+------+-------------------+
    |    0     |  0   |   0.2 (-28.57%)   |
    +----------+------+-------------------+
    |    1     |  0   |        0.2        |
    +----------+------+-------------------+
    |    1     |  0   |        0.26       |
    +----------+------+-------------------+

--------------

*Copyright (c) 2023-2025, Arm Limited. All rights reserved.*

.. _TF-A v2.13-rc0: https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/tags/v2.13-rc0
.. _TFTF v2.13-rc0: https://review.trustedfirmware.org/plugins/gitiles/TF-A/tf-a-tests/+/refs/tags/v2.13-rc0
.. _user guide: https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/blob/master/docs/n1sdp/user-guide.rst
.. _N1SDP: https://developer.arm.com/documentation/101489/latest