[GitHub] [mynewt-nimble] haukepetersen commented on issue #818: L2CAP COC: link throughput inconsistent and fluctuating

[GitBox <gi...@apache.org>]

haukepetersen commented on issue #818:
URL: https://github.com/apache/mynewt-nimble/issues/818#issuecomment-638873496


   Update: I still cannot specifically explain the throughput fluctuation. However, I was able to find a fix to get a stable throughput. Per default, the `MYNEWT_VAL_ACL_BUF_COUNT` variable for the RIOT port was set to `4`. Simply setting this to `5` (or any larger value) leads to a stable throughput of around ~62kb/s. 
   
   The issue above seems to be closely related to the value of `MYNEWT_VAL_ACL_BUF_COUNT`. If this value is too small, the throughput will decrease significantly:
   `MYNEWT_VAL_ACL_BUF_COUNT` := 1 --> ~2kb/s
   `MYNEWT_VAL_ACL_BUF_COUNT` := 2 --> ~4kb/s
   `MYNEWT_VAL_ACL_BUF_COUNT` := 3 --> ~6kb/s
   `MYNEWT_VAL_ACL_BUF_COUNT` := 4 --> ~8kb/s **BUT with temporary peaks to ~65kb/s**
   `MYNEWT_VAL_ACL_BUF_COUNT` >= 5 --> ~65kb/s
   
   So the question remains: why does the thoughput for `MYNEWT_VAL_ACL_BUF_COUNT := 4` fluctuate between slow and fast mode?


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