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SubjectTCP fix for sluggish rlogin/rsh

This is the right fix. It should apply cleanly to 2.1.90, but even if
it doesn't you can get the idea. We ACK quickly, if we see PSH _and_
we saw less than 1/2 the MSS worth of data in incoming packet.

--- net/ipv4/tcp_input.c.~1~ Wed Mar 18 19:20:15 1998
+++ net/ipv4/tcp_input.c Wed Mar 18 22:05:52 1998
@@ -1254,10 +1254,15 @@
dst_confirm(sk->dst_cache);
skb_queue_tail(&sk->receive_queue, skb);
tp->rcv_nxt = skb->end_seq;
- if(skb->h.th->fin)
+ if(skb->h.th->fin) {
tcp_fin(skb, sk, skb->h.th);
- else
+ } else {
tp->delayed_acks++;
+
+ /* Tiny-grams with PSH set make us ACK quickly. */
+ if(skb->h.th->psh && (skb->len < (sk->mss >> 1)))
+ tp->ato = HZ/50;
+ }
tcp_ofo_queue(sk);
if (skb_queue_len(&tp->out_of_order_queue) == 0)
tp->pred_flags = htonl(((tp->tcp_header_len >> 2) << 28) |
@@ -1623,6 +1628,11 @@
*/
sk->data_ready(sk, 0);
tcp_delack_estimator(tp);
+
+ /* Tiny-grams with PSH set make us ACK quickly. */
+ if(th->psh && (skb->len < (sk->mss >> 1)))
+ tp->ato = HZ/50;
+
tp->delayed_acks++;
__tcp_ack_snd_check(sk);
return 0;
-
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