From: Andi Kleen <[email protected]>
Date: Fri, 18 Aug 2006 20:17:18 +0200
>
> > @@ -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?
I think it isn't. It is really gross.
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