diff --git a/src/mpExperience.py b/src/mpExperience.py
index ace4de8..0fcf88c 100644
--- a/src/mpExperience.py
+++ b/src/mpExperience.py
@@ -26,14 +26,16 @@ class MpExperience:
 			print("Client : Error, I can't change the userspace pm if the kernel pm is not netlink !")
 		else:
 			upmc = self.xpParam.getParam(MpParamXp.USERPMC)
+			upmca = self.xpParam.getParam(MpParamXp.USERPMCARGS)
 			self.mpTopo.commandTo(self.mpConfig.client, upmc + \
-					"&>upmc.log &")
+					upmca + " &>upmc.log &")
 		if self.xpParam.getParam(MpParamXp.KERNELPMS) != "netlink":
 			print("Server : Error, I can't change the userspace pm if the kernel pm is not netlink !")
 		else:
 			upms = self.xpParam.getParam(MpParamXp.USERPMS)
+			upmsa = self.xpParam.getParam(MpParamXp.USERPMSARGS)
 			self.mpTopo.commandTo(self.mpConfig.server, upms + \
-					"&>upms.log &")
+					upmsa + " &>upms.log &")
 
 	def cleanUserspacePM(self):
 		if self.xpParam.getParam(MpParamXp.KERNELPMC) != "netlink":
diff --git a/src/mpParamXp.py b/src/mpParamXp.py
index 147a4aa..d7292e1 100644
--- a/src/mpParamXp.py
+++ b/src/mpParamXp.py
@@ -9,6 +9,8 @@ class MpParamXp(MpParam):
 	KERNELPMS  = "kpms"
 	USERPMC	   = "upmc"
 	USERPMS	   = "upms" #userspace path manager client / server
+	USERPMCARGS   = "upmc_args"
+	USERPMSARGS   = "upms_args"
 	CLIENTPCAP = "clientPcap"
 	SERVERPCAP = "serverPcap"
 	XPTYPE     = "xpType"
@@ -42,6 +44,8 @@ class MpParamXp(MpParam):
 	defaultValue[KERNELPMC] = "fullmesh"
 	defaultValue[USERPMC] = "fullmesh"
 	defaultValue[USERPMS] = "fullmesh"
+	defaultValue[USERPMCARGS] = ""
+	defaultValue[USERPMSARGS] = ""
 	defaultValue[SCHED] = "default"
 
 	defaultValue[CLIENTPCAP] = "no"