> TCP_CORK, or TCP_NODELAY flags I'm sending large messages, ~150 kibibytes, so much larger than a typical internet packet. So I'm not sure Nagle's algorithm

> TCP_CORK, or TCP_NODELAY flags I'm sending large messages, ~150 kibibytes, so much larger than a typical internet packet. So I'm not sure Nagle's algorithm is the problem. > tune the TCP-Window to your application. This is a possibility. I already had to increase wmem_max to handle fast udp connections. I'll try to put together a minimal test case when I get the chance.