Configurable yielding strategies in VNET bridge thread and tx kick threads

[palacios.git] / linux_module / palacios-vnet-brg.c

diff --git a/linux_module/palacios-vnet-brg.c b/linux_module/palacios-vnet-brg.c
index 309171d..999adcd 100644 (file)
--- a/linux_module/palacios-vnet-brg.c
+++ b/linux_module/palacios-vnet-brg.c
@@ -32,9 +32,9 @@
 
 #define VNET_SERVER_PORT 9000
 
-#define VNET_NOPROGRESS_LIMIT 1000
-
-#define VNET_YIELD_TIME_USEC  1000
+#define VNET_ADAPTIVE_BRIDGE  0      // 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
 
 struct vnet_link {
     uint32_t dst_ip;
@@ -472,7 +472,7 @@ static int _udp_server(void * arg) {
            
            // adaptively select yielding strategy depending on
            // whether we are making progress
-           if (noprogress_count < VNET_NOPROGRESS_LIMIT) { 
+           if ((!VNET_ADAPTIVE_BRIDGE) || (noprogress_count < VNET_NOPROGRESS_LIMIT)) { 
                // Likely making progress, do fast yield so we 
                // come back immediately if there is no other action
                palacios_yield_cpu();