- uint32_t toWrite = std::min({flow->remaining_, sock->GetTxAvailable()});
- if (toWrite == 0) // buffer full
+ // Send at most 1040 bytes (data size in a TCP packet), as NS3 seems to not split correctly by itself
+ uint32_t toWrite = std::min({flow->remaining_, sock->GetTxAvailable(), std::uint32_t(1040)});
+ if (toWrite == 0) { // buffer full
+ XBT_DEBUG("%f: buffer full on flow %p (still %u to go)", ns3::Simulator::Now().GetSeconds(), flow,
+ flow->remaining_);