skywind3000/kcp
Kcp
KCP is a low-latency transport protocol and reliability layer designed to provide TCP-like guaranteed delivery and ordering over UDP. It implements an automatic repeat request protocol to minimize network jitter and delays, prioritizing timeliness over bandwidth efficiency.
The project distinguishes itself through a pluggable congestion controller and flow control logic, allowing the transport layer to be tuned for specific network environments. It includes a NAT keep-alive system that uses periodic heartbeat packets to maintain active communication paths and prevent address translation timeouts.
The protocol covers broad networking capabilities including stream multiplexing, packet fragmentation and merging, and session identification via conversation identifiers. It also provides tools for network resilience testing through the simulation of packet loss and variable transmission delays.
The implementation is written in C and supports custom memory allocation for application-level memory management.
Features
- Low-Latency Data Transmission - Provides a low-latency transport protocol using ARQ over UDP to minimize network delays and jitter.
- UDP Transport Implementations - Implements a custom reliable transport protocol over UDP designed for low-latency and guaranteed delivery.
- Flow Control Mechanisms - Provides a pluggable mechanism to replace flow control logic and manage throughput without modifying the core protocol.
- Keep-Alive Signaling - Implements a keep-alive signaling system that sends periodic heartbeats to prevent UDP NAT translation timeouts.
- NAT Keep-Alive Signaling - Sends periodic heartbeat packets over UDP to prevent address translation timeouts and keep communication paths active.
- Network Protocol Implementations - Implements an ARQ-based network protocol to ensure reliable data transmission over unreliable transports.
- Network Reliability - Ensures guaranteed data delivery and connection stability over unreliable network conditions.
- Network Transport Protocols - Implements a specialized network transport protocol prioritizing timeliness for fast-action games and streaming.
- Congestion Controllers - Provides a pluggable congestion controller to dynamically adjust transmission rates based on network feedback.
- Retransmission Mechanisms - Provides an automatic repeat request mechanism for tracking and recovering lost packets to ensure reliability.
- Adaptive Retransmission Triggers - Implements adaptive timeout calculations that dynamically adjust retransmission triggers to minimize network jitter.
- Pluggable Congestion Controllers - Allows swapping congestion control algorithms via a pluggable interface to optimize for specific network environments.
- Transmission Window Buffering - Manages transmission throughput and memory usage via configurable window-based buffering for send and receive queues.
- Session Identifiers - Uses unique conversation identifiers in packet headers to route data to session objects without formal handshakes.
- Data Throughput Optimizers - Adjusts window sizes and flow control parameters to minimize round trip time and accelerate data delivery.
- High-Fidelity Streaming - Optimizes data delivery to decrease video playback interruptions and buffering for high-performance streaming.
- Fallback Mechanisms - Provides automated strategies to switch between UDP and TCP transport layers to ensure service availability.
- Connection Multiplexing - Bundles multiple reliable and raw data streams over a single physical connection using channel identifiers.
- Immediate Acknowledgment Modes - Improves latency for time-sensitive applications by bypassing congestion control algorithms and allowing immediate acknowledgments.
- Packet Fragmentation and Merging - Splits large data blocks into smaller units and merges them based on a configurable maximum transmission unit.
- Packet Constraint Configurations - Sets maximum transmission units and window sizes for sending and receiving packets to optimize network throughput.
- Game State Synchronization - Provides a low-latency synchronization mechanism for replicating game entity positions and actions between clients.
- Packet Fragmentation and Reassembly - Splits large data blocks into smaller units and merges fragments based on a configurable maximum transmission unit.
- Real-Time Synchronization - Enables low-latency synchronization of game states between clients and servers for real-time multiplayer gameplay.
- Stream Multiplexers - Implements channel-based stream multiplexing to combine multiple reliable and raw data streams over a single connection.
- Transport Layers - Allows adjustment of window sizes and flow control parameters to optimize transport layer throughput.
- Heartbeat-Driven NAT Maintenance - Uses periodic heartbeat packets over UDP to prevent address translation timeouts and maintain active communication paths.
- Runtime Parameter Tuning - Allows adjustment of transmission units, window sizes, and timeout intervals during execution for performance tuning.
- Networking - Fast reliable ARQ protocol.
- Game Networking Libraries - Fast and reliable ARQ protocol for low latency.
- Network Libraries - Fast and reliable ARQ protocol for low-latency communication.
- Networking Libraries - Fast and reliable ARQ protocol for low-latency communication.
Star history
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