README

The snf reader plugin now works directly with Myricom SNF

Optional settings

• snfNumRings number of rings and threads to use per interface
• snfDataRingSize SNF_DATARING_SIZE
• snfFlags Variable that controls process-sharing (1), port aggregation (2), and packet duplication (3), see SNF documentation for more details.
• snfNumProcs The number of capture processes sharing a given Myricom board
• snfProcNum The process number in the sharing cluster (If snfNumProcs=2, one process should have snfProcNum=1, the other =2)

Multiple capture processes per NIC requires some special settings

• Set the SNF_APP_ID environment variable to a unique (per host) value
• Make sure snfFlags includes the process sharing flag (0x01)
• Set snfNumProcs to the number of capture processes listening on the shared interface
• Set the snfProcNum for each process

To use:

• install the snf package on the build hosts and all hosts that will run capture
• build the plugin by using make in the capture/plugins/snf directory
• load the snf plugin by changing configuration file so it has reader-snf.so as a rootPlugins rootPlugins=reader-snf.so
• tell capture to use snf as the reader method with ```pcapReadMethod=snf`` in your configuration file
• change interface to either the OS interface name or snf# where # is the portnum