tcp_sack - tcp_sack - UG1586

Onload User Guide (UG1586)

Document_ID: UG1586
Release_Date: 2026-06-08
Revision: 1.5 English

Enable TCP selective acknowledgments, as per RFC2018.

Onload value

Enabled by default. Onload uses the currently active Linux setting.

Comments

Clear bit 2 of EF_TCP_SYN_OPTS (see EF_TCP_SYN_OPTS) to disable.