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docs: Update PRU command dispatch benchmark 

The PRU command dispatch benchmark was primarily limited by the speed
of the console.py tool on the slow beaglebone processor.  Add a note
on how to account for that and restate the PRU benchmark.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-02-12 12:34:41 -05:00
parent c5968a0830
commit 5db0b3d474
1 changed files with 6 additions and 3 deletions
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9
docs/Benchmarks.md
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@ -399,17 +399,20 @@ 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. The benchmarks below are with console.py running on a desktop
class machine with the device connected via a high-speed hub.
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.
| MCU | Rate | Build | Build compiler |
| ------------------- | ---- | -------- | ------------------- |
| pru (shared memory) | 5K | b161a69e | pru-gcc (GCC) 8.0.0 20170530 (experimental) |
| 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 |
| at90usb1286 (USB) | 75K | 01d2183f | avr-gcc (GCC) 5.4.0 |
| samd21 (USB) | 223K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
| pru (shared memory) | 260K | c5968a08 | pru-gcc (GCC) 8.0.0 20170530 (experimental) |
| stm32f103 (USB) | 355K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
| sam3x8e (USB) | 418K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |
| lpc1768 (USB) | 534K | 01d2183f | arm-none-eabi-gcc (Fedora 7.4.0-1.fc30) 7.4.0 |