I'll let others chime in, but the DCTCP paper mentions "our application reduces the amount of data each worker sends and employs jitter. Facebook, reportedly, h

I'll let others chime in, but the DCTCP paper mentions "our application reduces the amount of data each worker sends and employs jitter. Facebook, reportedly, has gone to the extent of developing their own UDP-based congestion control [29]." I recently talked with someone on the Facebook memcached team about this problem and they mentioned that moving to UDP has been useful, but if I'm not mistaken, I believe they gave up on 100% in-order reliability in return for low-latency.