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praneethbajjuri merged 4 commits into from
Apr 28, 2026
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Sdk12.0 cyclictest #686

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67a44f5
feat(AM64X): Add PREEMPT_RT perf numbers
bryanbrattlof Apr 16, 2026
70ee2ce
feat(AM62PX): Add PREEMPT_RT perf numbers
bryanbrattlof Apr 17, 2026
39857e3
feat(AM62AX): Add PREEMPT_RT perf numbers
bryanbrattlof Apr 17, 2026
5afad4e
feat(AM62LX): Add PREEMPT_RT perf numbers
bryanbrattlof Apr 22, 2026
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6 changes: 3 additions & 3 deletions source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst
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Expand Up @@ -77,8 +77,8 @@ default SDK image:
.. csv-table::
:header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3"

"Minimum (us)","5","5","5","5"
"Average (us)","6","6","6","6"
"Maximum (us)","31","29","30","30"
"Minimum (us)","4","4","4","5"
"Average (us)","5","5","5","5"
"Maximum (us)","35","45","34","38"

.. image:: img/rt-cpu-method-all-latency-histogram.png
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47 changes: 46 additions & 1 deletion source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst
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Expand Up @@ -36,4 +36,49 @@
System Benchmarks
*****************

|
Stress-ng and Cyclic Test

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[RedHat.Headings] Use sentence-style capitalization in 'Stress-ng and Cyclic Test'.

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{"message": "[RedHat.Headings] Use sentence-style capitalization in 'Stress-ng and Cyclic Test'.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 39, "column": 1}}}, "severity": "INFO"}
=========================

.. _RT-linux-performance:

stress-ng (next-generation) will stress test a embedded platform in
various selectable ways. It was designed to exercise various physical

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[RedHat.PassiveVoice] 'was designed' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.

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{"message": "[RedHat.PassiveVoice] 'was designed' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 45, "column": 29}}}, "severity": "INFO"}
subsystems as well as the various operating system kernel interfaces.

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[RedHat.TermsWarnings] Consider using 'and' rather than 'as well as' unless updating existing content that uses the term.

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{"message": "[RedHat.TermsWarnings] Consider using 'and' rather than 'as well as' unless updating existing content that uses the term.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 46, "column": 12}}}, "severity": "WARNING"}
stress-ng can also measure test throughput rates; this can be useful to
observe performance changes across different operating system or types
of hardware.

Cyclictest is most commonly used for benchmarking RT systems. It is one
of the most frequently used tools for evaluating the relative

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[RedHat.SimpleWords] Use simple language. Consider using 'often' rather than 'frequently'.

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{"message": "[RedHat.SimpleWords] Use simple language. Consider using 'often' rather than 'frequently'.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 52, "column": 13}}}, "severity": "INFO"}
performance of real-time systems. Some performance tests which use

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[RedHat.TermsSuggestions] Depending on the context, consider using 'that' or ', which' rather than 'which'.

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{"message": "[RedHat.TermsSuggestions] Depending on the context, consider using 'that' or ', which' rather than 'which'.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 53, "column": 58}}}, "severity": "INFO"}
Cyclictest are System benchmarking, Latency debugging with tracing and
-approximating application performance.

Test commands used for running stress-ng and cyclictest together

.. code:: console

stress-ng --cpu-method=all -c 4 &
cyclictest -m -Sp80 -D6h -h400 -i200 -M -q

The following summarizes the latencies observed using the yocto based
default SDK image:

.. note::

A known issue in this SDK release is affecting this benchmark.
Using OP-TEE's PRNG drivers rather than the hardware accelerated TRNG

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[RedHat.Definitions] Define acronyms and abbreviations (such as 'TRNG') on first occurrence if they're likely to be unfamiliar.

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'TRNG') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 70, "column": 69}}}, "severity": "INFO"}

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'PRNG') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 70, "column": 19}}}, "severity": "INFO"}

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[RedHat.Definitions] Define acronyms and abbreviations (such as 'TEE') on first occurrence if they're likely to be unfamiliar.

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'TEE') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 70, "column": 13}}}, "severity": "INFO"}
drivers restores the context switch latencies to the values you see
here.

More information on switching to the PRNG drivers can be found in the

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'PRNG') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 74, "column": 41}}}, "severity": "INFO"}

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{"message": "[RedHat.TermsSuggestions] Depending on the context, consider using 'information about' rather than 'information on'.", "location": {"path": "source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst", "range": {"start": {"line": 74, "column": 9}}}, "severity": "INFO"}
Foundational Components section, here :ref:`building-optee-with-prng`

.. csv-table::
:header: "Latencies","CPU 0","CPU 1"

"Minimum (usec)","4","4"
"Average (usec)","7","6"
"Maximum (usec)","68","72"

.. image:: img/rt-cpu-method-all-latency-histogram.png
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47 changes: 46 additions & 1 deletion source/devices/AM62PX/linux/RT_Linux_Performance_Guide.rst
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Expand Up @@ -36,4 +36,49 @@ https://e2e.ti.com/ or https://support.ti.com/
System Benchmarks
*****************

|
Stress-ng and Cyclic Test
Comment thread
praneethbajjuri marked this conversation as resolved.

.. _RT-linux-performance:

stress-ng (next-generation) will stress test a embedded platform in various selectable ways.
It was designed to exercise various physical subsystems as well as the various
operating system kernel interfaces. stress-ng can also measure test throughput rates;
this can be useful to observe performance changes across different operating system or types of hardware.

Cyclictest is most commonly used for benchmarking RT systems.
It is one of the most frequently used tools for evaluating the relative performance of real-time systems.
Some performance tests which use Cyclictest are System benchmarking, Latency debugging with tracing and
approximating application performance.

Test commands used for running stress-ng and cyclictest together

.. code:: console

stress-ng --cpu-method=all -c 4 &
cyclictest -m -Sp80 -D6h -h400 -i200 -M -q

The following summarizes the latencies observed using the yocto based
default SDK image

.. note::

Using the OP-TEE TRNG driver can impact this benchmark's performance due to
frequent context switching between Normal World (Linux) and Secure World (OP-TEE),
that occurs when the kernel's hardware random number generator interface
(hwrng) requests entropy from the secure TRNG to replenish the Linux entropy
pool.

The Linux TRNG driver can mitigate these latency spikes. This involves
enabling the Pseudo RNG driver in OP-TEE as documented in the Foundational
Components section: :ref:`building-optee-with-prng`, and enabling the RNG
node in the Linux kernel device tree. This way the HW TRNG is accessed from
the kernel itself.

.. csv-table::
:header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3"

"Minimum (usec)","4","4","4","4"
"Average (usec)","5","5","5","5"
"Maximum (usec)","39","42","44","47"

.. image:: img/rt-cpu-method-all-latency-histogram.png
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47 changes: 46 additions & 1 deletion source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst
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Expand Up @@ -36,7 +36,52 @@ https://e2e.ti.com/ or https://support.ti.com/
System Benchmarks
*****************

|
Stress-ng and Cyclic Test
=========================

.. _RT-linux-performance:

stress-ng (next-generation) will stress test a embedded platform in
various selectable ways. It was designed to exercise various physical
subsystems as well as the various operating system kernel interfaces.
stress-ng can also measure test throughput rates; this can be useful to
observe performance changes across different operating system or types
of hardware.

Cyclictest is most commonly used for benchmarking RT systems. It is one
of the most frequently used tools for evaluating the relative
performance of real-time systems. Some performance tests which use
Cyclictest are System benchmarking, Latency debugging with tracing and
-approximating application performance.

Test commands used for running stress-ng and cyclictest together

.. code:: console

stress-ng --cpu-method=all -c 4 &
cyclictest -m -Sp80 -D6h -h400 -i200 -M -q

The following summarizes the latencies observed using the yocto based
default SDK image:

.. note::

A known issue in this SDK release is affecting this benchmark.
Using OP-TEE's PRNG drivers rather than the hardware accelerated TRNG
drivers restores the context switch latencies to the values you see
here.

More information on switching to the PRNG drivers can be found in the
Foundational Components section, here :ref:`building-optee-with-prng`

.. csv-table::
:header: "Latencies","CPU 0","CPU 1"

"Minimum (usec)","5","5"
"Average (usec)","7","8"
"Maximum (usec)","69","77"

.. image:: img/rt-cpu-method-all-latency-histogram.png

LMBench
=======
Expand Down
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