From: Peter Dinda <pdinda@northwestern.edu>
Date: Thu, 10 Oct 2013 20:27:12 +0000 (-0500)
Subject: Switch VNET to use adaptive yielding by default, to reduce busy-waiting in the bridge... 
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=118812a7a69c964dc50022f2e30cc04643d81c0f

Switch VNET to use adaptive yielding by default, to reduce busy-waiting in the bridge and transmit-kick threads
---

diff --git a/linux_module/palacios-vnet-brg.c b/linux_module/palacios-vnet-brg.c
index 1dfe8a8..829c069 100644
--- a/linux_module/palacios-vnet-brg.c
+++ b/linux_module/palacios-vnet-brg.c
@@ -32,7 +32,7 @@
 
 #define VNET_SERVER_PORT 9000
 
-#define VNET_ADAPTIVE_BRIDGE  0      // set this to one to have bridge go to sleep if there nothing to do...
+#define VNET_ADAPTIVE_BRIDGE  1      // set this to one to have bridge go to sleep if there nothing to do...
 #define VNET_NOPROGRESS_LIMIT 1000   // ... after this many iterations
 #define VNET_YIELD_TIME_USEC  1000   // ... and go to sleep for this long
 
@@ -479,7 +479,7 @@ static int _udp_server(void * arg) {
 	    } else {
 		// Likely not making progress, do potentially slow
 		// yield - we won't come back for until VNET_YIELD_TIME_USEC has passed
-		palacios_yield_cpu_timed(VNET_YIELD_TIME_USEC);
+		palacios_sleep_cpu(VNET_YIELD_TIME_USEC);
 	    }
 
 	    continue;
diff --git a/palacios/src/vnet/vnet_core.c b/palacios/src/vnet/vnet_core.c
index 7d9942d..70ba382 100644
--- a/palacios/src/vnet/vnet_core.c
+++ b/palacios/src/vnet/vnet_core.c
@@ -33,7 +33,7 @@
 
 #define VNET_NUM_TX_KICK_THREADS 1
 
-#define VNET_ADAPTIVE_TX_KICK 0         // set to 1 to try to sleep when there is nothing to do
+#define VNET_ADAPTIVE_TX_KICK 1         // set to 1 to try to sleep when there is nothing to do
 #define VNET_NOPROGRESS_LIMIT 1000      //   ... after this many tries
 #define VNET_YIELD_USEC       1000      //   ... and go to sleep for this long