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tcp: increase tcp_rmem[2] to 32 MB

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Last change to tcp_rmem[2] happened in 2012, in commit b49960a05e
("tcp: change tcp_adv_win_scale and tcp_rmem[2]")

TCP performance on WAN is mostly limited by tcp_rmem[2] for receivers.

After this series improvements, it is time to increase the default.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250513193919.1089692-12-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-05-13 19:39:19 +00:00
committed by Jakub Kicinski
parent c4221a8cc3
commit 572be9bf9d
2 changed files with 2 additions and 2 deletions
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2
Documentation/networking/ip-sysctl.rst
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@@ -735,7 +735,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
net.core.rmem_max. Calling setsockopt() with SO_RCVBUF disables
automatic tuning of that socket's receive buffer size, in which
case this value is ignored.
Default: between 131072 and 6MB, depending on RAM size.
Default: between 131072 and 32MB, depending on RAM size.
tcp_sack - BOOLEAN
Enable select acknowledgments (SACKS).