bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 14:53:58 -04:00
Code Issues Packages Projects Releases Wiki Activity

net: set net.core.rmem_max and net.core.wmem_max to 4 MB

Browse Source 
SO_RCVBUF and SO_SNDBUF have limited range today, unless
distros or system admins change rmem_max and wmem_max.

Even iproute2 uses 1 MB SO_RCVBUF which is capped by
the kernel.

Decouple [rw]mem_max and [rw]mem_default and increase
[rw]mem_max to 4 MB.

Before:

$ sysctl net.core.rmem_default net.core.rmem_max net.core.wmem_default net.core.wmem_max
net.core.rmem_default = 212992
net.core.rmem_max = 212992
net.core.wmem_default = 212992
net.core.wmem_max = 212992

After:

$ sysctl net.core.rmem_default net.core.rmem_max net.core.wmem_default net.core.wmem_max
net.core.rmem_default = 212992
net.core.rmem_max = 4194304
net.core.wmem_default = 212992
net.core.wmem_max = 4194304

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20250819174030.1986278-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-08-19 17:40:30 +00:00
committed by Jakub Kicinski
parent 2a2e6e5375
commit a6d4f25888
6 changed files with 15 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/admin-guide/sysctl/net.rst
View File

@@ -222,6 +222,8 @@ rmem_max
The maximum receive socket buffer size in bytes.
Default: 4194304
rps_default_mask
----------------
@@ -247,6 +249,8 @@ wmem_max
The maximum send socket buffer size in bytes.
Default: 4194304
message_burst and message_cost
------------------------------