From 46aaeb56660ef727c30841718331fef45e8377be Mon Sep 17 00:00:00 2001
From: Thilo Schulz <arny@ats.s.bawue.de>
Date: Fri, 15 Jul 2011 16:51:54 +0000
Subject: Move rate limiting / queued packet sending logic from Com_Frame() to
 sv_main.c

---
 src/server/sv_main.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

(limited to 'src/server/sv_main.c')

diff --git a/src/server/sv_main.c b/src/server/sv_main.c
index 166e2241..fdd7127b 100644
--- a/src/server/sv_main.c
+++ b/src/server/sv_main.c
@@ -51,6 +51,7 @@ cvar_t	*sv_mapChecksum;
 cvar_t	*sv_serverid;
 cvar_t	*sv_minRate;
 cvar_t	*sv_maxRate;
+cvar_t	*sv_dlRate;
 cvar_t	*sv_minPing;
 cvar_t	*sv_maxPing;
 cvar_t	*sv_pure;
@@ -1188,3 +1189,83 @@ int SV_RateMsec(client_t *client)
 	else
 		return rateMsec - rate;
 }
+
+/*
+====================
+SV_SendQueuedPackets
+
+Send download messages and queued packets in the time that we're idle, i.e.
+not computing a server frame or sending client snapshots.
+Return the time in msec until we expect to be called next
+====================
+*/
+
+int SV_SendQueuedPackets()
+{
+	int numBlocks;
+	int dlStart, deltaT, delayT;
+	static int dlNextRound = 0;
+	int timeVal = INT_MAX;
+
+	// Send out fragmented packets now that we're idle
+	delayT = SV_SendQueuedMessages();
+	if(delayT >= 0)
+		timeVal = delayT;
+
+	if(sv_dlRate->integer)
+	{
+		// Rate limiting. This is very imprecise for high
+		// download rates due to millisecond timedelta resolution
+		dlStart = Sys_Milliseconds();
+		deltaT = dlNextRound - dlStart;
+
+		if(deltaT > 0)
+		{
+			if(deltaT < timeVal)
+				timeVal = deltaT + 1;
+		}
+		else
+		{
+			numBlocks = SV_SendDownloadMessages();
+
+			if(numBlocks)
+			{
+				// There are active downloads
+				deltaT = Sys_Milliseconds() - dlStart;
+
+				delayT = 1000 * numBlocks * MAX_DOWNLOAD_BLKSIZE;
+				delayT /= sv_dlRate->integer * 1024;
+
+				if(delayT <= deltaT + 1)
+				{
+					// Sending the last round of download messages
+					// took too long for given rate, don't wait for
+					// next round, but always enforce a 1ms delay
+					// between DL message rounds so we don't hog
+					// all of the bandwidth. This will result in an
+					// effective maximum rate of 1MB/s per user, but the
+					// low download window size limits this anyways.
+					if(timeVal > 2)
+						timeVal = 2;
+
+					dlNextRound = dlStart + deltaT + 1;
+				}
+				else
+				{
+					dlNextRound = dlStart + delayT;
+					delayT -= deltaT;
+
+					if(delayT < timeVal)
+						timeVal = delayT;
+				}
+			}
+		}
+	}
+	else
+	{
+		if(SV_SendDownloadMessages())
+			timeVal = 0;
+	}
+
+	return timeVal;
+}
-- 
cgit