EF_TCP_FASTSTART_INIT - EF_TCP_FASTSTART_INIT - UG1586

Onload User Guide (UG1586)

Document_ID
UG1586
Release_Date
2026-06-08
Revision
1.5 English
Name
tcp_faststart_init
Default
65536
Minimum
0
Scope
per-stack

The FASTSTART feature prevents Onload from delaying ACKs during times when doing so might reduce performance. FASTSTART is enabled when a connection is new, following loss and after the connection has been idle for a while.

This option sets the number of bytes that must be ACKed by the receiver before the connection exits FASTSTART. Set to zero to disable FASTSTART on new connections.