diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-03-28 17:40:30 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-03-30 01:03:10 +0300 |
| commit | 6a1f12dd85a8b24f871dfcf467378660af9c064d (patch) | |
| tree | cb52518234de5cc5eabe543f60265f8b3699ae35 /net | |
| parent | 60557969951304dad829f2829019907dfb43ecb3 (diff) | |
| download | linux-6a1f12dd85a8b24f871dfcf467378660af9c064d.tar.xz | |
udp: relax atomic operation on sk->sk_rmem_alloc
atomic_add_return() is more expensive than atomic_add()
and seems overkill in UDP rx fast path.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240328144032.1864988-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/udp.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 6a39e7fa0616..19d7db4563ac 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1516,12 +1516,7 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb) size = skb->truesize; udp_set_dev_scratch(skb); - /* we drop only if the receive buf is full and the receive - * queue contains some other skb - */ - rmem = atomic_add_return(size, &sk->sk_rmem_alloc); - if (rmem > (size + (unsigned int)sk->sk_rcvbuf)) - goto uncharge_drop; + atomic_add(size, &sk->sk_rmem_alloc); spin_lock(&list->lock); err = udp_rmem_schedule(sk, size); |