[FS#105] lantiq: high latency on adsl lines using pppo[ae]

[LEDE Bugs]

The following task has a new comment added:

FS#105 - lantiq: high latency on adsl lines using pppo[ae]
User who did this - Jim Gettys (jgettys)

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Did the lantiq driver get some bufferbloat debloating love?  

When I last looked at it maybe 3 years ago, it had 128 packets of buffering in its ring buffering.  This can cause really large amounts of latency any time the link saturates.

DSL needs something equivalent to the BQL algorithm used on ethernet to keep the ring buffer size no more than necessary for the bandwidth.  Unfortunately, it was never feasible for me to go further in and try to fix it.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=105#comment1348