Improve TCP sockets latency

src/main/scala/SpinalRiscv/TopLevel.scala

@@ -129,28 +129,28 @@ object TopLevel {
 //              portTlbSize = 4
 //            )
           ),
-//          new DBusSimplePlugin(
+          new DBusSimplePlugin(
-//            catchAddressMisaligned = true,
+            catchAddressMisaligned = true,
-//            catchAccessFault = true
+            catchAccessFault = true
-//          ),
-          new DBusCachedPlugin(
-            config = new DataCacheConfig(
-              cacheSize         = 4096,
-              bytePerLine       = 32,
-              wayCount          = 1,
-              addressWidth      = 32,
-              cpuDataWidth      = 32,
-              memDataWidth      = 32,
-              catchAccessError  = true,
-              catchIllegal      = true,
-              catchUnaligned    = true,
-              catchMemoryTranslationMiss = true
-            ),
-            memoryTranslatorPortConfig = null
-//            memoryTranslatorPortConfig = MemoryTranslatorPortConfig(
-//              portTlbSize = 6
-//            )
           ),
+//          new DBusCachedPlugin(
+//            config = new DataCacheConfig(
+//              cacheSize         = 4096,
+//              bytePerLine       = 32,
+//              wayCount          = 1,
+//              addressWidth      = 32,
+//              cpuDataWidth      = 32,
+//              memDataWidth      = 32,
+//              catchAccessError  = true,
+//              catchIllegal      = true,
+//              catchUnaligned    = true,
+//              catchMemoryTranslationMiss = true
+//            ),
+//            memoryTranslatorPortConfig = null
+////            memoryTranslatorPortConfig = MemoryTranslatorPortConfig(
+////              portTlbSize = 6
+////            )
+//          ),
           new StaticMemoryTranslatorPlugin(
             ioRange      = _(31 downto 28) === 0xF
           ),
@@ -191,7 +191,8 @@ object TopLevel {
             earlyBranch = false,
             catchAddressMisaligned = true,
             prediction = DYNAMIC
-          )
+          ),
+          new YamlPlugin("cpu0")
         )
       )
 

src/test/cpp/briey/main.cpp

@@ -136,6 +136,7 @@ public:
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#include <netinet/tcp.h>
 
 /** Returns true on success, or false if there was an error */
 bool SetSocketBlockingEnabled(int fd, bool blocking)
@@ -183,6 +184,14 @@ public:
 		// 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) //
 		serverSocket = socket(PF_INET, SOCK_STREAM, 0);
 		assert(serverSocket != -1);
+		int flag = 1;
+		setsockopt(  serverSocket,            /* socket affected */
+					 IPPROTO_TCP,     /* set option at TCP level */
+					 TCP_NODELAY,     /* name of option */
+					 (char *) &flag,  /* the cast is historical
+											 cruft */
+					 sizeof(int));    /* length of option value */
+
 		SetSocketBlockingEnabled(serverSocket,0);
 
 

src/test/cpp/regression/main.cpp

@@ -630,6 +630,7 @@ public:
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#include <netinet/tcp.h>
 
 /** Returns true on success, or false if there was an error */
 bool SetSocketBlockingEnabled(int fd, bool blocking)
@@ -671,7 +672,13 @@ public:
 		serverSocket = socket(PF_INET, SOCK_STREAM, 0);
 		assert(serverSocket != -1);
 		SetSocketBlockingEnabled(serverSocket,0);
-
+		int flag = 1;
+		int result = setsockopt(serverSocket,            /* socket affected */
+								 IPPROTO_TCP,     /* set option at TCP level */
+								 TCP_NODELAY,     /* name of option */
+								 (char *) &flag,  /* the cast is historical
+														 cruft */
+								 sizeof(int));    /* length of option value */
 
 		//---- Configure settings of the server address struct ----//
 		// Address family = Internet //

src/test/cpp/regression/makefile

@@ -1,5 +1,5 @@
 IBUS=IBUS_CACHED
-DBUS=DBUS_CACHED
+DBUS=DBUS_SIMPLE
 TRACE?=no
 TRACE_ACCESS?=no
 TRACE_START=0