Increase UDP transport socket buffer size to 24M!

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@261 74dad513-b988-da41-8d7b-12977e46ad98

2 files changed, 18 insertions, 5 deletions

diff --git a/pjsip/build/pjsip_simple.dsp b/pjsip/build/pjsip_simple.dsp
index 1bca33f2..6e6643f6 100644
--- a/pjsip/build/pjsip_simple.dsp
+++ b/pjsip/build/pjsip_simple.dsp
@@ -41,7 +41,7 @@ RSC=rc.exe
 # PROP Intermediate_Dir "./output/pjsip-simple-i386-win32-vc6-release"

 # PROP Target_Dir ""

 # ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_MBCS" /D "_LIB" /YX /FD /c

-# ADD CPP /nologo /MD /W3 /GX /O2 /I "../include" /I "../../pjlib-util/include" /I "../../pjlib/include" /D "NDEBUG" /D PJ_WIN32=1 /D PJ_M_I386=1 /D "WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c

+# ADD CPP /nologo /MD /W4 /GX /O2 /I "../include" /I "../../pjlib-util/include" /I "../../pjlib/include" /D "NDEBUG" /D PJ_WIN32=1 /D PJ_M_I386=1 /D "WIN32" /D "_MBCS" /D "_LIB" /YX /FD /c

 # ADD BASE RSC /l 0x409 /d "NDEBUG"

 # ADD RSC /l 0x409 /d "NDEBUG"

 BSC32=bscmake.exe

@@ -64,7 +64,7 @@ LIB32=link.exe -lib
 # PROP Intermediate_Dir "./output/pjsip-simple-i386-win32-vc6-debug"

 # PROP Target_Dir ""

 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_MBCS" /D "_LIB" /YX /FD /GZ /c

-# ADD CPP /nologo /MTd /W3 /Gm /GX /ZI /Od /I "../include" /I "../../pjlib-util/include" /I "../../pjlib/include" /D "_DEBUG" /D PJ_WIN32=1 /D PJ_M_I386=1 /D "WIN32" /D "_MBCS" /D "_LIB" /FR /YX /FD /GZ /c

+# ADD CPP /nologo /MTd /W4 /Gm /GX /ZI /Od /I "../include" /I "../../pjlib-util/include" /I "../../pjlib/include" /D "_DEBUG" /D PJ_WIN32=1 /D PJ_M_I386=1 /D "WIN32" /D "_MBCS" /D "_LIB" /FR /YX /FD /GZ /c

 # ADD BASE RSC /l 0x409 /d "_DEBUG"

 # ADD RSC /l 0x409 /d "_DEBUG"

 BSC32=bscmake.exe

diff --git a/pjsip/src/pjsip/sip_transport_udp.c b/pjsip/src/pjsip/sip_transport_udp.c
index ec6c6353..8ab38edf 100644
--- a/pjsip/src/pjsip/sip_transport_udp.c
+++ b/pjsip/src/pjsip/sip_transport_udp.c
@@ -32,15 +32,28 @@
 #define THIS_FILE   "sip_transport_udp.c"
 
 /**
- * These are the values for socket send and receive buffer sizes,
+ * These are the target values for socket send and receive buffer sizes,
  * respectively. They will be applied to UDP socket with setsockopt().
+ * When transport failed to set these size, it will decrease it until
+ * sufficiently large number has been successfully set.
+ *
+ * The buffer size is important, especially in WinXP/2000 machines.
+ * Basicly the lower the size, the more packets will be lost (dropped?)
+ * when we're sending (receiving?) packets in large volumes.
+ * 
+ * The figure here is taken based on my experiment on WinXP/2000 machine,
+ * and with this value, the rate of dropped packet is about 8% when
+ * sending 1800 requests simultaneously (percentage taken as average
+ * after 50K requests or so).
+ *
+ * More experiments are needed probably.
  */
 #ifndef PJSIP_UDP_SO_SNDBUF_SIZE
-#   define PJSIP_UDP_SO_SNDBUF_SIZE	(4*1024*1024)
+#   define PJSIP_UDP_SO_SNDBUF_SIZE	(24*1024*1024)
 #endif
 
 #ifndef PJSIP_UDP_SO_RCVBUF_SIZE
-#   define PJSIP_UDP_SO_RCVBUF_SIZE	(4*1024*1024)
+#   define PJSIP_UDP_SO_RCVBUF_SIZE	(24*1024*1024)
 #endif