diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-12-14 10:48:59 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-12-15 11:01:26 +0000 |
| commit | 4944566706b27918ca15eda913889db296792415 (patch) | |
| tree | 1e160c6b6ecaa5d209620e62a1a9f6a562de37aa /Documentation/admin-guide/sysctl | |
| parent | e16064c9af7fe5a2220f7ad5f9be6fd7516e427c (diff) | |
| download | lwn-4944566706b27918ca15eda913889db296792415.tar.gz lwn-4944566706b27918ca15eda913889db296792415.zip | |
net: increase optmem_max default value
For many years, /proc/sys/net/core/optmem_max default value
on a 64bit kernel has been 20 KB.
Regular usage of TCP tx zerocopy needs a bit more.
Google has used 128KB as the default value for 7 years without
any problem.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/admin-guide/sysctl')
| -rw-r--r-- | Documentation/admin-guide/sysctl/net.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst index c7525942f12c..396091651955 100644 --- a/Documentation/admin-guide/sysctl/net.rst +++ b/Documentation/admin-guide/sysctl/net.rst @@ -345,7 +345,10 @@ optmem_max ---------- Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence -of struct cmsghdr structures with appended data. +of struct cmsghdr structures with appended data. TCP tx zerocopy also uses +optmem_max as a limit for its internal structures. + +Default : 128 KB fb_tunnels_only_for_init_net ---------------------------- |