use system default now that auto scaling is supported...

still let users set this if needed...

ggatec/ggatec.8

@@ -128,10 +128,10 @@ start to be canceled.
 Default is 1024.
 .It Fl R Ar rcvbuf
 Size of receive buffer to use.
-Default is 131072 (128kB).
+When not specified, the system default is used.
 .It Fl S Ar sndbuf
 Size of send buffer to use.
-Default is 131072 (128kB).
+When not specified, the system default is used.
 .It Fl s Ar sectorsize
 Sector size for
 .Nm ggate

ggated/ggated.8

@@ -74,10 +74,10 @@ PID file that
 uses.
 .It Fl R Ar rcvbuf
 Size of receive buffer to use.
-Default is 131072 (128kB).
+When not specified, the system default is used.
 .It Fl S Ar sndbuf
 Size of send buffer to use.
-Default is 131072 (128kB).
+When not specified, the system default is used.
 .It Fl v
 Do not fork, run in foreground and print debug information on standard
 output.

shared/ggate.c

@@ -271,8 +271,8 @@ g_gate_recv(int s, void *buf, size_t len, int flags)
 }
 
 int nagle = 1;
-unsigned rcvbuf = G_GATE_RCVBUF;
-unsigned sndbuf = G_GATE_SNDBUF;
+unsigned rcvbuf = 0;
+unsigned sndbuf = 0;
 
 void
 g_gate_socket_settings(int sfd)
@@ -290,12 +290,16 @@ g_gate_socket_settings(int sfd)
 	}
 	if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
 		g_gate_xlog("setsockopt(SO_REUSEADDR): %s.", strerror(errno));
-	bsize = rcvbuf;
-	if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, &bsize, sizeof(bsize)) == -1)
-		g_gate_xlog("setsockopt(SO_RCVBUF): %s.", strerror(errno));
-	bsize = sndbuf;
-	if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, &bsize, sizeof(bsize)) == -1)
-		g_gate_xlog("setsockopt(SO_SNDBUF): %s.", strerror(errno));
+	if (rcvbuf != 0) {
+		bsize = rcvbuf;
+		if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, &bsize, sizeof(bsize)) == -1)
+			g_gate_xlog("setsockopt(SO_RCVBUF): %s.", strerror(errno));
+	}
+	if (sndbuf != 0) {
+		bsize = sndbuf;
+		if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, &bsize, sizeof(bsize)) == -1)
+			g_gate_xlog("setsockopt(SO_SNDBUF): %s.", strerror(errno));
+	}
 	tv.tv_sec = 8;
 	tv.tv_usec = 0;
 	if (setsockopt(sfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) == -1) {

shared/ggate.h

@@ -36,8 +36,6 @@
 
 #define	G_GATE_PORT		3080
 
-#define	G_GATE_RCVBUF		131072
-#define	G_GATE_SNDBUF		131072
 #define	G_GATE_QUEUE_SIZE	1024
 #define	G_GATE_TIMEOUT		0