Reducing footprint of ESP-Matter (CON-464)

[marcelgoh]

Hi,

I'm trying to gauge the size/memory consumption of Matter in order to see if we can incorporate it into our project. I did idf.py size-components on the light example and got this: As I understand, the libbtdm_app.a and libnet80211.a components are related to bluetooth and thread respectively. If I do not need this for my use-case, is it possible to remove these components by disabling the respective features? I tried CONFIG_BT_ENABLE=n in sdkconfig.defaults but that didn't change the binary size or the presence of that .a file.

It is worrying to me that even an app as simple as the light example already uses a significant portion of DRAM/IRAM. If you had any other suggestions as to how one might reduce the size / RAM usage of ESP-Matter, I would appreciate hearing them as well! Thanks in advance.

[jonsmirl]

You likely need to use a module with PSRAM on it. I can run a single button device on a C3 without PSRAM. But the eight button, keypad version of the same device needs PSRAM. Once you add PSRAM you should have plenty of memory. Just make sure to set allocation strategy to use PSRAM in the various components.

[igrr]

I tried CONFIG_BT_ENABLE=n in sdkconfig.defaults but that didn't change the binary size or the presence of that .a file.

Please note that IDF build system only uses sdkconfig.defaults file when no sdkconfig file exists. If you want to make some configuration changes, you can either a) edit sdkconfig or b) edit sdkconfig.defaults and delete sdkconfig, so that it gets re-generated on next build.

However, given that network provisioning functionality depends on Bluetooth, I doubt that disabling Bluetooth will work without further changes.

[marcelgoh]

Thanks for the super quick replies! @jonsmirl sorry for the amateur question, but PSRAM this available for my ESP32-WROVER-E and what is the best way to enable it/ensure that it's enabled? I searched PSRAM in sdkconfig and only found CONFIG_SPIRAM, which I'm not sure is the right setting to set.

@igrr Ah, sorry for the dumb mistake! I deleted sdkconfig before rebuilding and that whole .a file is now gone, reducing the binary size. And I did some basic tests and everything seems to still work the same as before over WiFi? Would you know the corresponding setting to get rid of libnet80211.a, so I can test if that still works too?

[jonsmirl]

PSRAM and SPIRAM are the same thing. How you turn it on varies with the IDF version. But after you get it turned on it will print how much PSRAM is available when it boots. I have 8MB on my module.

I (1271) heap_init: Initializing. RAM available for dynamic allocation:
I (1272) heap_init: At 3FCB4D80 len 00034990 (210 KiB): DRAM
I (1272) heap_init: At 3FCE9710 len 00005724 (21 KiB): STACK/DRAM
I (1272) heap_init: At 3FCF0000 len 00008000 (32 KiB): DRAM
I (1273) heap_init: At 600FE010 len 00001FF0 (7 KiB): RTCRAM
I (1725) esp_psram: Adding pool of 8192K of PSRAM memory to heap allocator
I (1726) spi_flash: detected chip: generic
I (1726) spi_flash: flash io: dio
W (1726) spi_flash: Detected size(8192k)

[marcelgoh]

Ah, thanks, it appears mine is already enabled, though perhaps not completely set up right:

I (585) quad_psram: This chip is ESP32-D0WD
I (585) esp_psram: Found 8MB PSRAM device
I (585) esp_psram: Speed: 40MHz
I (589) esp_psram: PSRAM initialized, cache is in low/high (2-core) mode.
W (596) esp_psram: Virtual address not enough for PSRAM, map as much as we can. 4MB is mapped

[jonsmirl]

Now you need to turn it on in the various components.

[dhrishi]

@marcelgoh Please close this issue if you are able to use the PSRAM and move things into it

[marcelgoh]

Hi, sorry but I'm still unable to use all 8MB of my PSRAM, even after setting Flash size to 8MB in the Serial flasher options of idf.py menuconfig. Is the 4MB the best that is possible, despite the fact that it says "Found 8MB PSRAM device"?

[PSONALl]

@marcelgoh Have you tried setting Flash size to 4MB and setting Octal SPIRAM, It worked for me in case of esp32s3 Which kit are you using?

[marcelgoh]

@PSONALl where is the setting for Octal SPIRAM in menuconfig? I'm not seeing it in Serial flasher config

[jonsmirl]

Using 8MB is not so simple on an older ESP32. Here is how to do it... https://github.com/espressif/esp-idf/tree/master/examples/system/himem

Much easier to just switch onto a new ESP32S3 module where using the 8MB is straight forward.

[marcelgoh]

Ah, okay yes I'm using the older ESP32. Thanks for linking that example though!