instructions for compiling mapi with PACKET_MMAP support.

git-svn-id: file:///home/svn/mapi/trunk@1303 8d5bb341-7cf1-0310-8cf6-ba355fef3186

INSTALL

@@ -178,6 +178,31 @@ The simplest way to compile this package is:
      all sorts of other programs in order to regenerate files that came
      with the distribution.
 
+Using PACKET_MMAP
+=================
+
+The process of packet capture is very efficient when using PACKET_MMAP.
+A libpcap version which supports MMAP mode on linux kernels 2.[46].x can
+be found at http://public.lanl.gov/cpw/. The compilation of the library
+is very easy - just follow the instructions included in the archive.
+There is no need to install it in the system.
+
+Once compiled, you have to configure mapi to be linked with the new 
+pcap instead of the default one. To do this, use the '--with-libpcap=DIR'
+switch described above (see MAPI configure-time switches section), where
+DIR is the path of the MMAP'ed libpcap.
+
+In order to test that mapi daemon is compiled with the mmaped libpcap
+just type:
+
+PCAP_FRAMES=100 PCAP_VERBOSE=1 PCAP_TO_MS=0 PCAP_PERIOD=10000 \
+PCAP_STATS=0x1fff mapid
+
+You can change the size of the ring buffer by setting different values 
+to PCAP_FRAMES depending on your needs. Assuming all went well you should
+start to see summary statistics which might assume some meaning after
+reading http://public.lanl.gov/cpw/README.ring.html.
+
 Compilers and Options
 =====================
 

configure.ac

@@ -469,7 +469,7 @@ AS_HELP_STRING([--with-libpcap=DIR], [Manual libpcap path configuration, in case
         owd=`pwd`
         if cd $withval; then withval=`pwd`; cd $owd; fi
 	PCAPINC="-I$withval -I$withval/bpf"
-	PCAPLIB="-L$withval -lpcap"
+	PCAPLIB="-L$withval $withval/libpcap.a"
      else
         AC_MSG_ERROR(pcap.h or libpcap.a not found in $withval)
      fi