TCP CUBIC
In networks with large bandwidth or a long delay TCP Reno yields low network utilisation. TCP CUBIC is the more efficient implementation used within the linux kernal. CUBIC still uses a reset for a timeout and halves when it gets a triple unacknowledged message. Though this implementation uses two different features to TCP Reno:
- A cubic polynomial increase function.
- Increase is based off the time since the last packet loss instead increasing when it gets an ACK packet.
Let
be the window size, and lets say we are given two constants and . Suppose we get a packet loss when is at and let be the time since that event. First set then we set our window size to be
