File man-pages-tcp_fack.patch of Package man-pages
--- man-pages-5.03.orig/man7/tcp.7 2019-10-11 10:56:08.000000000 +0200
+++ man-pages-5.03/man7/tcp.7 2019-10-25 09:36:55.047041318 +0200
@@ -458,9 +458,31 @@ When enabled, outgoing ECN-setup SYNs th
normal SYN retransmission timeout will be resent with CWR and
-.IR tcp_fack " (Boolean; default: enabled; since Linux 2.2)"
+.IR tcp_fack " (integer; default: see below; since Linux 2.2)"
.\" Since 2.1.92
Enable TCP Forward Acknowledgement support.
+Prior to Linux 4.11, this option was enabled by default.
+In Linux 4.11, it was disabled by default in favor of RACK (see
+In Linux 4.15 it was deprecated entirely and its value is ignored.
+.IR tcp_recovery " (integer; default: 0x1; since Linux 4.4)"
+Enable various experimental loss recovery features.
+This field is a bitmap to enable various loss recovery features.
+enables the RACK loss detection for fast detection of lost
+retransmissions and tail drops. It also subsumes and disables
+RFC6675 recovery for SACK connections. (Since Linux 4.4)
+makes RACK's reordering window static (min_rtt/4). (Since
+disables RACK's DUPACK threshold heuristic (Since Linux
.IR tcp_fin_timeout " (integer; default: 60; since Linux 2.2)"
.\" Since 2.1.53