From 03bcc4db7995b38ecda927e65d7bf2e657477664 Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@nyus.joshuawise.com>
Date: Sat, 6 Dec 2008 07:22:48 -0500
Subject: [PATCH] Be a little bit quieter, and consequentially be a lot bit
 faster.

---
 net/net.c |  3 ++-
 net/rfb.c | 23 +++++++----------------
 2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/net/net.c b/net/net.c
index 5d0c75b..e7bb80a 100644
--- a/net/net.c
+++ b/net/net.c
@@ -30,6 +30,7 @@ void eth_poll()
 	struct pbuf *p;
 	struct eth_hdr *ethhdr;
 	static int ticks = 0;
+	int i = 15;	/* Don't process more than 15 packets at a time; we don't want the host to get TOO badly slowed down... */
 	
 	if (!_nic)
 		return;
@@ -44,7 +45,7 @@ void eth_poll()
 		tcp_tmr();
 	ticks++;
 
-	if ((p = _nic->recv(_nic)) != NULL)
+	while ((i--) && ((p = _nic->recv(_nic)) != NULL))
 	{
 //		outputf("NIC: Packet: %d bytes", p->tot_len);
 			
diff --git a/net/rfb.c b/net/rfb.c
index ff0f089..057c406 100644
--- a/net/rfb.c
+++ b/net/rfb.c
@@ -185,7 +185,6 @@ static void send_fsm(struct tcp_pcb *pcb, struct rfb_state *state) {
 		/* FALL THROUGH */
 
 	case SST_SENDING:
-
 		while (1) {
 			unsigned char mbuf[8192	/* XXX magic */];
 			
@@ -199,26 +198,18 @@ static void send_fsm(struct tcp_pcb *pcb, struct rfb_state *state) {
 			if (left > 8192)
 				left = 8192;
 
-			if (left > tcp_mss(pcb)) {
-				sndlength = tcp_mss(pcb);
-			} else {
-				sndlength = left;
-			}
+			memcpy(mbuf, fb->fbaddr + state->update_pos, left);	/* It's OK if it becomes smaller later. */
 			
-			memcpy(mbuf, fb->fbaddr + state->update_pos, sndlength);	/* It's OK if it becomes smaller later. */
-
+			sndlength = left;
 			do {
 				err = tcp_write(pcb, mbuf, sndlength, TCP_WRITE_FLAG_COPY /* This is my memory on the stack, thank you very much. */);
-				if (err == ERR_MEM) {
-					outputf("RFB: ERR_MEM sending %d", sndlength);
+				if (err == ERR_MEM)		/* Back down until lwip says we've got space. */
 					sndlength /= 2;
-				}
 			} while (err == ERR_MEM && sndlength > 1);
 
-			if (err == ERR_OK) {
-				outputf("RFB: attempting send %d", sndlength);
-			} else {
-				outputf("RFB: send error %d", err);
+			if (err != ERR_OK) {
+				/* We'll just give up for now and come back when we have space later. */
+				//outputf("RFB: send error %d", err);
 				break;
 			}
 
@@ -460,7 +451,7 @@ static err_t rfb_recv(void *arg, struct tcp_pcb *pcb,
 		case OK:
 			outputf("RFB FSM: ok");
 
-			/* Might as well send now... */
+			/* Kick off a send. */
 			if (state->send_state == SST_IDLE
 			    && state->update_requested) {
 				send_fsm(pcb, state);
-- 
2.39.2