DataCenter TCP (DCTCP)

modulename: tcp_dctcp.ko


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>TCP: advanced congestion control
└─>DataCenter TCP (DCTCP)
In linux kernel since version 3.18 (release Date: 2014-12-07)  
DCTCP leverages Explicit Congestion Notification (ECN) in the network to
provide multi-bit feedback to the end hosts. It is designed to provide:

- High burst tolerance (incast due to partition/aggregate),
- Low latency (short flows, queries),
- High throughput (continuous data updates, large file transfers) with
commodity, shallow-buffered switches.

All switches in the data center network running DCTCP must support
ECN marking and be configured for marking when reaching defined switch
buffer thresholds. The default ECN marking threshold heuristic for
DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
(~100KB) at 10Gbps, but might need further careful tweaking.

For further details see:

source code: