diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2022-10-20 20:48:52 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-10-24 12:52:50 +0300 |
| commit | 8a3854c7b8e4532063b14bed34115079b7d0cb36 (patch) | |
| tree | cd84d6b901d6d1e14185481909982e4f267cd512 /include/net/udp.h | |
| parent | a5ef058dc4d9a3e60d1808a0700e18e0e37e408e (diff) | |
| download | linux-8a3854c7b8e4532063b14bed34115079b7d0cb36.tar.xz | |
udp: track the forward memory release threshold in an hot cacheline
When the receiver process and the BH runs on different cores,
udp_rmem_release() experience a cache miss while accessing sk_rcvbuf,
as the latter shares the same cacheline with sk_forward_alloc, written
by the BH.
With this patch, UDP tracks the rcvbuf value and its update via custom
SOL_SOCKET socket options, and copies the forward memory threshold value
used by udp_rmem_release() in a different cacheline, already accessed by
the above function and uncontended.
Since the UDP socket init operation grown a bit, factor out the common
code between v4 and v6 in a shared helper.
Overall the above give a 10% peek throughput increase under UDP flood.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/udp.h')
| -rw-r--r-- | include/net/udp.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index fee053bcd17c..de4b528522bb 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -174,6 +174,15 @@ INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *)); struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, netdev_features_t features, bool is_ipv6); +static inline void udp_lib_init_sock(struct sock *sk) +{ + struct udp_sock *up = udp_sk(sk); + + skb_queue_head_init(&up->reader_queue); + up->forward_threshold = sk->sk_rcvbuf >> 2; + set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags); +} + /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ static inline int udp_lib_hash(struct sock *sk) { |