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doc:appunti:hardware:raspberrypi_3 [2024/03/21 23:14] – niccolodoc:appunti:hardware:raspberrypi_3 [2024/03/22 07:13] (current) – niccolo
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-====== Kodi on the Raspberry Pi 3 ======+====== Kodi on the Raspberry Pi 3 and CMA problems ======
  
-Running **Kodi 19.4** on the **Raspberry Pi 3 Model B Plus Rev 1.3** with **Raspberry Pi OS** based on Debian 11.9, I experienced some weird crashes of the Kodi interface: sometimes the Kodi process suddendly restart while I'm browsing a folder with about 200 video items.+I installed **Kodi 19.4** on the **Raspberry Pi 3 Model B Plus Rev 1.3**, running the **Raspberry Pi OS** based on **Debian 11.9**. Unfortunately I experienced some weird crashes of the Kodi program: sometimes the Kodi process suddendly restart while I'm browsing a folder with about 200 video items.
  
 The error messages are revealed by the **dmesg** output: The error messages are revealed by the **dmesg** output:
Line 23: Line 23:
 </code> </code>
  
-In **/boot/config.txt** you should confirm that you are loading the **vc4-kms-v3d** overlay, which will use the **VideoCore IV GPU** available on the Raspberry Pi 3.+In **/boot/config.txt** you should confirm that you are loading the **vc4-kms-v3d** overlay, which is the module dedicated to GPU management, the **VideoCore IV GPU** available on the Raspberry Pi 3:
  
 <code> <code>
Line 34: Line 34:
  
 <file> <file>
-# Default cma reserved memory is 256 Mb, use 480 instead. +# Default cma reserved memory is 256 Mb, use 512 instead. 
-dtoverlay=cma,cma-size=503316480+dtoverlay=cma,cma-size=536870912
 </file> </file>
  
Line 41: Line 41:
  
 <file> <file>
-gpu_mem=128+gpu_mem=92
 </file> </file>
 +
 +With 92 Mb of GPU memory I'm still able to play 1920x1080 videos without issues. Many features of the VideoCore IV GPU use the CMA reserved memory, not this GPU reserver one.
 +
 +You can check how many GPU memory is used during Kodi normal operation, just launch the {{.raspberrypi:bcmstat.sh.gz|bcmstat.sh}} script and let it run:
 +
 +<code>
 +./bcmstat.sh Dd5
 +</code>
  
 At next reboot I verified that the new setting is in place, checking the **dmesg** output: At next reboot I verified that the new setting is in place, checking the **dmesg** output:
  
 <code> <code>
-[    0.000000] Reserved memory: created CMA memory pool at 0x10c00000, size 480 MiB +[    0.000000] Reserved memory: created CMA memory pool at 0x0ec00000, size 512 MiB 
-[    0.000000] Memory: 398320K/917504K available (10240K kernel code, 1452K rwdata, +[    0.000000] Memory: 402028K/954368K available (10240K kernel code, 1452K rwdata, 
-               2900K rodata, 1024K init, 613K bss, 27664K reserved, 491520K cma-reserved)+               2900K rodata, 1024K init, 613K bss, 28052K reserved, 524288K cma-reserved)
 </code> </code>
  
Line 56: Line 64:
 <code> <code>
                total        used        free      shared  buff/cache   available                total        used        free      shared  buff/cache   available
-Mem:          890864      286280      287876        2836      316708      546816+Mem:          927340      321760      319708        2836      285872      548032
 Swap:         524284           0      524284 Swap:         524284           0      524284
 </code> </code>
  
-About **280 Mb of free memory** should suffice for normal operations.+About **300 Mb of free memory** should suffice for normal operations.
  
doc/appunti/hardware/raspberrypi_3.1711059251.txt.gz · Last modified: 2024/03/21 23:14 by niccolo