hack: try to avoid "buffer full" problem when pushing DL traffic
This is hack-level development. With this commit you can do UDP DL traffic of say 100Mb/s over a 5MHz link with one connected UE and the eNB should not crash because of memory exhaustion. Of course on the receiver side you won't get 100Mb/s and many many lost packets. But the system should not crash. 1Gb/s does not work. So in any case try to remain within some reasonable limits. There is no reason to push more than twice the maximum achievable throughput of the link. This work is based on a patch proposed by Francesco Gringoli.
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