1 files changed, 9 insertions, 1 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 722c8bceaf9a..4fcc9a768849 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -948,7 +948,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
         skb_orphan(skb);
         skb->sk = sk;
-        skb->destructor = tcp_wfree;
+        skb->destructor = skb_is_tcp_pure_ack(skb) ? sock_wfree : tcp_wfree;
         skb_set_hash_from_sk(skb, sk);
         atomic_add(skb->truesize, &sk->sk_wmem_alloc);
 
@@ -3270,6 +3270,14 @@ void tcp_send_ack(struct sock *sk)
         skb_reserve(buff, MAX_TCP_HEADER);
         tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK);
 
+        /* We do not want pure acks influencing TCP Small Queues or fq/pacing
+         * too much.
+         * SKB_TRUESIZE(max(1 .. 66, MAX_TCP_HEADER)) is unfortunately ~784
+         * We also avoid tcp_wfree() overhead (cache line miss accessing
+         * tp->tsq_flags) by using regular sock_wfree()
+         */
+        skb_set_tcp_pure_ack(buff);
+
         /* Send it off, this clears delayed acks for us. */
         skb_mstamp_get(&buff->skb_mstamp);
         tcp_transmit_skb(sk, buff, 0, sk_gfp_atomic(sk, GFP_ATOMIC));