davids5 commented on issue #6835: URL: https://github.com/apache/incubator-nuttx/issues/6835#issuecomment-1212979151
@PetervdPerk-NXP - This is really nice to see. The Diagrams rock! We should definitely be using Scatter Gather DMA. The approach of using many little IOBs will cause a high load on the number of statically allocated DMA descriptors (TCD) needed (32 bytes per and some non-net devices need 4-6 per transaction already). There may be a size for the built in data IOB that is a good balance. An alternate could be to reference the data and carry a `size` and `used` and maybe a `next` reference in the IOB and not include the data allocation in the struct. These can be allocated at initialization time and static at run time. Then pools can be formed and used by the devices with MTU requirement. It could fail over to allocating a bigger MTU on smaller starvation and manage it with the `size` and `used` to return it to the correct pool. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
