In my testing on pcap I get:
[18806] 25/11/2013 -- 14:40:29 - (source-pcap.c:515) <Warning> (ReceivePcapThreadInit) -- [ERRCODE: SC_ERR_AFP_CREATE(190)] - Using Pcap capture with GRO or LRO activated can lead tocapture problems for kernel with packet mmap support.

The packet mmap support seems a bit meaningless here. Shall we make it something like:
"GRO and/or LRO detected on %s: this can lead to capture problems."