use bpf to fast drop multicast on listener thread
A means to measure network responsiveness and throughput
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#271 use bpf to fast drop multicast on listener thread
Multicast listener needs to fast drop packets already assigned to a server thread
THREAD(506388):[14:13:36.474584] Jobq *REMOVE* 0x7f9f740022a0
THREAD(506392):[14:13:36.506709] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506392):[14:13:36.506818] Listener main loop port 5004
THREAD(506389):[14:13:36.510752] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506389):[14:13:36.510852] Listener main loop port 5001
THREAD(506391):[14:13:36.510903] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506391):[14:13:36.510974] Listener main loop port 5003
THREAD(506393):[14:13:36.511218] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506393):[14:13:36.511281] Listener main loop port 5005
THREAD(506390):[14:13:36.512682] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506390):[14:13:36.512777] Listener main loop port 5002
THREAD(506394):[14:13:36.513043] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506394):[14:13:36.513097] Listener main loop port 5006
THREAD(506392):[14:13:36.556914] Listener single client loop mc/t/mcast/sc -1/1/1/0
THREAD(506392):[14:13:36.557014] Listener main loop port 5004
THREAD(506389):[14:13:36.560972] Listener single client loop mc/t/mcast/sc -1/1/1/0
