37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
diff -Nur man-pages-6.02/man7/tcp.7 new/man7/tcp.7
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--- man-pages-6.02/man7/tcp.7 2022-12-22 20:25:12.000000000 +0100
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+++ new/man7/tcp.7 2022-12-28 00:46:39.396907119 +0100
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@@ -491,9 +491,31 @@
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normal SYN retransmission timeout will be resent with CWR and
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ECE cleared.
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.TP
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-.IR tcp_fack " (Boolean; default: enabled; since Linux 2.2)"
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+.IR tcp_fack " (integer; default: see below; since Linux 2.2)"
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.\" Since Linux 2.1.92
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Enable TCP Forward Acknowledgement support.
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+
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+Prior to Linux 4.11, this option was enabled by default.
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+In Linux 4.11, it was disabled by default in favor of RACK (see
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+tcp_recovery).
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+In Linux 4.15 it was deprecated entirely and its value is ignored.
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+.TP
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+.IR tcp_recovery " (integer; default: 0x1; since Linux 4.4)"
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+Enable various experimental loss recovery features.
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+
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+This field is a bitmap to enable various loss recovery features.
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+.RS
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+.IP 0x1
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+enables the RACK loss detection for fast detection of lost
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+retransmissions and tail drops. It also subsumes and disables
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+RFC6675 recovery for SACK connections. (Since Linux 4.4)
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+.IP 0x2
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+makes RACK's reordering window static (min_rtt/4). (Since
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+Linux 4.15)
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+.IP 0x4
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+disables RACK's DUPACK threshold heuristic (Since Linux
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+4.18).
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+.RE
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.TP
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.IR tcp_fin_timeout " (integer; default: 60; since Linux 2.2)"
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.\" Since Linux 2.1.53
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