Eric Dumazet
e3d4825124
udp: move udp_memory_allocated into net_aligned_data
...
____cacheline_aligned_in_smp attribute only makes sure to align
a field to a cache line. It does not prevent the linker to use
the remaining of the cache line for other variables, causing
potential false sharing.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Reviewed-by: Willem de Bruijn <willemb@google.com >
Link: https://patch.msgid.link/20250630093540.3052835-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
2025-07-02 14:22:02 -07:00
Eric Dumazet
8308133741
tcp: move tcp_memory_allocated into net_aligned_data
...
____cacheline_aligned_in_smp attribute only makes sure to align
a field to a cache line. It does not prevent the linker to use
the remaining of the cache line for other variables, causing
potential false sharing.
Move tcp_memory_allocated into a dedicated cache line.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Reviewed-by: Willem de Bruijn <willemb@google.com >
Link: https://patch.msgid.link/20250630093540.3052835-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
2025-07-02 14:22:02 -07:00
Eric Dumazet
998642e999
net: move net_cookie into net_aligned_data
...
Using per-cpu data for net->net_cookie generation is overkill,
because even busy hosts do not create hundreds of netns per second.
Make sure to put net_cookie in a private cache line to avoid
potential false sharing.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Reviewed-by: Willem de Bruijn <willemb@google.com >
Link: https://patch.msgid.link/20250630093540.3052835-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
2025-07-02 14:22:02 -07:00
Eric Dumazet
3715b5df09
net: add struct net_aligned_data
...
This structure will hold networking data that must
consume a full cache line to avoid accidental false sharing.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Reviewed-by: Willem de Bruijn <willemb@google.com >
Link: https://patch.msgid.link/20250630093540.3052835-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
2025-07-02 14:22:02 -07:00
