diff options
| author |   Paolo Abeni <pabeni@redhat.com> | 2017-05-16 11:20:14 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-05-16 15:41:29 -0400 |
| commit | 2276f58ac5890e58d2b6a48b95493faff7347e3a (patch) | |
| tree | c77ce6fd0b942dfddb145e1ad6dbb2fb1942d849 /include/net/udp.h | |
| parent | net/sock: factor out dequeue/peek with offset code (diff) | |
| download | linux-dev-2276f58ac5890e58d2b6a48b95493faff7347e3a.tar.xz linux-dev-2276f58ac5890e58d2b6a48b95493faff7347e3a.zip | |
udp: use a separate rx queue for packet reception
under udp flood the sk_receive_queue spinlock is heavily contended.
This patch try to reduce the contention on such lock adding a
second receive queue to the udp sockets; recvmsg() looks first
in such queue and, only if empty, tries to fetch the data from
sk_receive_queue. The latter is spliced into the newly added
queue every time the receive path has to acquire the
sk_receive_queue lock.
The accounting of forward allocated memory is still protected with
the sk_receive_queue lock, so udp_rmem_release() needs to acquire
both locks when the forward deficit is flushed.
On specific scenarios we can end up acquiring and releasing the
sk_receive_queue lock multiple times; that will be covered by
the next patch
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.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, 2 insertions, 7 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index 3391dbd73959..1468dbd0f09a 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -249,13 +249,8 @@ void udp_destruct_sock(struct sock *sk); void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len); int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb); void udp_skb_destructor(struct sock *sk, struct sk_buff *skb); -static inline struct sk_buff * -__skb_recv_udp(struct sock *sk, unsigned int flags, int noblock, int *peeked, - int *off, int *err) -{ - return __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), - udp_skb_destructor, peeked, off, err); -} +struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, + int noblock, int *peeked, int *off, int *err); static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags, int noblock, int *err) { |