take into account the kernel doubling the value at setting

sctp.py

@@ -72,6 +72,7 @@
 import datetime
 import time
 import os
+import sys
 
 ####################################### CONSTANTS
 
@@ -1106,7 +1107,8 @@ def getladdrs(self, assoc_id = 0): # -> tuple of sockaddrs as strings
 
 		return _sctp.getladdrs(self._sk.fileno(), assoc_id)
 
-	def sctp_send(self, msg, to=("",0), ppid=0, flags=0, stream=0, timetolive=0, context=0, record_file_prefix="RECORD_sctp_traffic", datalogging = False):
+	def sctp_send(self, msg, to=("",0), ppid=0, flags=0, stream=0, timetolive=0, context=0,
+	                    record_file_prefix="RECORD_sctp_traffic", datalogging = False):
 		"""
 		Sends a SCTP message. While send()/sendto() can also be used, this method also
 		accepts some SCTP-exclusive metadata. Parameters:
@@ -1364,12 +1366,13 @@ def get_sndbuf(self):
 		Gets the send buffer size from the kernel for this socket.
 		"""
 		return _sctp.get_sndbuf(self._sk.fileno())
-
+        
 	def set_sndbuf(self, rvalue):
 		"""
 		Sets the send buffer size in the kernel for this socket.
 		"""
-		_sctp.set_sndbuf(self._sk.fileno(), rvalue)
+		# Linux doubles the size, hence we divise it by 2
+		_sctp.set_sndbuf(self._sk.fileno(), rvalue//2)
 
 	def get_disable_fragments(self):
 		"""