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tcp: fix tcp_rmem documentation

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tcp_rmem[1] has been changed to 131072, we should update the documentation
to reflect this.

Fixes: a337531b942b ("tcp: up initial rmem to 128KB and SYN rwin to around 64KB")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Zhibin Liu <zhibinliu@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-02-10 09:13:33 -08:00 committed by David S. Miller
parent f1d77b2efb
commit 1d1be91254
1 changed files with 3 additions and 4 deletions
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7
Documentation/networking/ip-sysctl.rst
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@ -630,16 +630,15 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
default: initial size of receive buffer used by TCP sockets. default: initial size of receive buffer used by TCP sockets.
This value overrides net.core.rmem_default used by other protocols. This value overrides net.core.rmem_default used by other protocols.
Default: 87380 bytes. This value results in window of 65535 with Default: 131072 bytes.
default setting of tcp_adv_win_scale and tcp_app_win:0 and a bit This value results in initial window of 65535.
less for default tcp_app_win. See below about these variables.
max: maximal size of receive buffer allowed for automatically max: maximal size of receive buffer allowed for automatically
selected receiver buffers for TCP socket. This value does not override selected receiver buffers for TCP socket. This value does not override
net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables
automatic tuning of that socket's receive buffer size, in which automatic tuning of that socket's receive buffer size, in which
case this value is ignored. case this value is ignored.
Default: between 87380B and 6MB, depending on RAM size. Default: between 131072 and 6MB, depending on RAM size.
tcp_sack - BOOLEAN tcp_sack - BOOLEAN
Enable select acknowledgments (SACKS). Enable select acknowledgments (SACKS).