diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-08-26 12:50:31 +0000 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2025-08-28 13:14:50 +0200 |
| commit | b81aa23234d94d99951761d9864061d774633ba9 (patch) | |
| tree | b01e1a944d6271c3505baaeff3fa5f1cd3663e06 /net/ipv6 | |
| parent | 51132b99f01ce05f8008f0fb189d83eed484bd53 (diff) | |
inet: raw: add drop_counters to raw sockets
When a packet flood hits one or more RAW sockets, many cpus
have to update sk->sk_drops.
This slows down other cpus, because currently
sk_drops is in sock_write_rx group.
Add a socket_drop_counters structure to raw sockets.
Using dedicated cache lines to hold drop counters
makes sure that consumers no longer suffer from
false sharing if/when producers only change sk->sk_drops.
This adds 128 bytes per RAW socket.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250826125031.1578842-6-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/raw.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 4026192143ec..4ae07a67b4d4 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -1175,6 +1175,7 @@ static int rawv6_init_sk(struct sock *sk) { struct raw6_sock *rp = raw6_sk(sk); + sk->sk_drop_counters = &rp->drop_counters; switch (inet_sk(sk)->inet_num) { case IPPROTO_ICMPV6: rp->checksum = 1; |