Update divf.retronetworking.org to latest osmo-e1d and increase prefill levels for transatlantic users
The current osmo-e1d RIFO prefill levels are around 300 frames, just enough for 37.5ms of jitter. Some users experience very volatile RTT values, with jitter above 37.5ms.
The latest osmo-e1d is able to handle RIFO prefill levels on a per user basis.
Please update divf.retronetworking.org to the latest osmo-e1d and increase prefill levels for transatlantic users, such as cquirin, to say 500-600 frames.
In a second step, a higher maximum number of frames in the RIFO might be required. The RIFO is currently limited to 800 frames, as per #define in a header.