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docs: Update CAN bus command rate benchmarks

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Add a benchmark for the rp2350 device when running via CAN bus.
Remove the old stm32f042 CAN bus benchmark as that test predates a
number of importnat CAN bus code changes and is likely no longer
accurate.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-05-31 12:24:40 -04:00
parent 1f3b4cc749
commit d25602e88d
1 changed files with 12 additions and 7 deletions
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19
docs/Benchmarks.md
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@ -463,18 +463,23 @@ When the test completes, determine the difference between the clocks
reported in the two "uptime" response messages. The total number of
commands per second is then `100000 * mcu_frequency / clock_diff`.
Note that this test may saturate the USB/CPU capacity of a Raspberry
Pi. If running on a Raspberry Pi, Beaglebone, or similar host computer
then increase the delay (eg, `DELAY {clock + 20*freq} get_uptime`).
Where applicable, the benchmarks below are with console.py running on
a desktop class machine with the device connected via a high-speed
hub.
The USB tests may exceed the CPU capacity of a Raspberry Pi. If
running on a Raspberry Pi, Beaglebone, or similar host computer then
increase the delay (eg, `DELAY {clock + 20*freq} get_uptime`). Where
applicable, the benchmarks below are with console.py running on a
desktop class machine with the device connected via a super-speed hub.
The CAN bus tests may saturate the USB host controller of a Raspberry
Pi (when testing via a standard gs_usb USB to CAN bus adapter). Where
applicable, the CAN bus benchmarks below are with console.py running
on a desktop class machine with a USB to CAN bus adapter connected via
a super-speed USB hub.
| MCU | Rate | Build | Build compiler |
| ------------------- | ---- | -------- | ------------------- |
| stm32f042 (CAN) | 18K | c105adc8 | arm-none-eabi-gcc (GNU Tools 7-2018-q3-update) 7.3.1 |
| atmega2560 (serial) | 23K | b161a69e | avr-gcc (GCC) 4.8.1 |
| sam3x8e (serial) | 23K | b161a69e | arm-none-eabi-gcc (Fedora 7.1.0-5.fc27) 7.1.0 |
| rp2350 (CAN) | 59K | 17b8ce4c | arm-none-eabi-gcc (Fedora 14.1.0-1.fc40) 14.1.0 |
| at90usb1286 (USB) | 75K | 01d2183f | avr-gcc (GCC) 5.4.0 |
| ar100 (serial) | 138K | 08d037c6 | or1k-linux-musl-gcc 9.3.0 |
| samd21 (USB) | 223K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |