Migration from 4.1.1 to 4.4.4 IRAM usage increases over 175%

[Alexandr]

After change ESP-IDF from 4.1.1 to 4.4.4 and compile project, I was very surprised by the increased volume of IRAM usage from ~54Kb to ~123Kb. Comparsion table is below:

Code: [Select all] [Expand/Collapse]

1. Component               IDF 4.1.1   IDF 4.4.4   DIFF
2. libapp_update.a         154         371         -217
3. libbootloader_support.a 863         2657        -1794
4. libbutton.a             22          76          -54
5. libcharge_status.a      40          102         -62
6. libcoexist.a            3700        3185        515
7. libesp_ringbuf.a        3398        5705        -2307
8. libesp_wifi.a           469         840         -371
9. libfreertos.a           14870       28327       -13457
10. libhal.a                443         9806        -9363
11. libheap.a               1740        17483       -15743
12. liblis2dh12_routine.a   34          95          -61
13. liblog.a                258         43          215
14. libnewlib.a             804         2298        -1494
15. libpthread.a            186         287         -101
16. libqma7981_routine.a    18          28          -10
17. librtc.a                2239        2211        28
18. libspi_flash.a          5667        15657       -9990
19. libxtensa.a             145         117         28
20. libdriver.a             1907        0           1907
21. libesp_common.a         932         0           932
22. libesp32.a              8104        0           8104
23. libgcc.a                193         0           193
24. libsoc.a                8194        0           8194
25. libactive.a             0           46          -46
26. libaht10.a              0           46          -46
27. libcoap_urls.a          0           46          -46
28. libdebug_console.a      0           46          -46
29. libesp_hw_support.a     0           14907       -14907
30. libesp_ipc.a            0           890         -890
31. libesp_phy.a            0           221         -221
32. libesp_pm.a             0           1823        -1823
33. libesp_rom.a            0           303         -303
34. libesp_system.a         0           4834        -4834
35. libesp_timer.a          0           2296        -2296
36. libfailure.a            0           46          -46
37. libgsm.a                0           92          -92
38. libindication.a         0           46          -46
39. liblogic_event_processor0           46          -46
40. libmultisensor.a        0           46          -46
41. libota.a                0           46          -46
42. libphy.a                0           7762        -7762
43. libqma7981.a            0           46          -46
44. libservice.a            0           46          -46
45. libsettings.a           0           46          -46
46. libsntp_runner.a        0           46          -46
47. libsystem_info.a        0           46          -46
48. libwho_am_i.a           0           46          -46
49. libxt_hal.a             0           443         -443
50. TOTAL:                  54380       123549      -69169

GeSHi © Codebox Plus Extension

According to the table, you can see that the amount of IRAM memory usage has increased by 69.1 Kb. The source codes were changed minimally, only for compilation complete successful. Only names of some types and structures have changed, for example:

it was coap_tid_t, it became coap_mid_t, and so on.

I have not found any new IDF settings regarding IRAM. Is the new IDF that fat? What then is in version 5.x.x?

Link result:

Code: Select all

xtensa-esp32-elf/bin/ld: region `iram0_0_seg' overflowed by 32380 bytes

Are there any compilation options or settings that can quickly minimize the use of IRAM ??

[ESP_Mahavir]

Are there any compilation options or settings that can quickly minimize the use of IRAM ??

We have a guide to optimize on the IRAM usage: https://docs.espressif.com/projects/esp ... iram-usage

[Alexandr]

Are there any compilation options or settings that can quickly minimize the use of IRAM ??

We have a guide to optimize on the IRAM usage: https://docs.espressif.com/projects/esp ... iram-usage

The application of all the recommendations gave an insignificant result...
Overflows IRAM changed from 32380 to 30672.

First of all, I wonder where so much memory comes from in the new versions of these components?

Code: Select all

Component               IDF 4.1.1I  DF4.4.4	DIFF
libfreertos.a           14870       28327       -13457
libhal.a                443         9806        -9363
libheap.a               1740        17483       -15743
libspi_flash.a          5667        15657       -9990
libesp_hw_support.a     0           14907       -14907

For example libspi_flash.a, it was 5667 bytes, it became 15657 bytes???
I didn't find any settings that affect the memory of the SPI_Flash component so much, as well as libhal and others.

Do you have any ideas on the components above?

[ESP_Mahavir]

Hello,

Would it be possible for you to compare any IDF example that is close to your use-case and compare its memory numbers against 4.1.1 and 4.4.4 release? Please share the application and sdk configuration, I will take a look..

Note: Tool `idf_size.py` also supports `--diff` command where it can present the difference in the memory numbers between 2 application map files.

Thanks.