> @@ -1136,7 +1137,8 @@ int tcp_recvmsg(struct kiocb *iocb, stru
> skb = skb_peek_tail(&sk->sk_receive_queue);
> if (skb)
> available = TCP_SKB_CB(skb)->seq + skb->len - (*seq);
> - if ((available < target) &&
> + dst = __sk_dst_get(sk);
> + if ((available < target) && (!dst || (dst->dev != &loopback_dev)) &&
You just added another potential cache miss to a critical
path. A bit flag in the socket would be better.
But is it really worth this ugly special case?
-Andi
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