linux - Dropwatch reports drop in ip_rcv -


i have network capture device running centos 7 receives span traffic core switch. unfortunately, kernel dropping packets (about ~0,05%). installed dropwatch investigate issue , reports drops in ip_rcv+c0:

example:

5994 drops @ ip_rcv+c0 (0xffffffff81509950) 5106 drops @ ip_rcv+c0 (0xffffffff81509950) 3840 drops @ ip_rcv+c0 (0xffffffff81509950) 6294 drops @ ip_rcv+c0 (0xffffffff81509950) 3209 drops @ ip_rcv+c0 (0xffffffff81509950)

here link particular function (/net/ipv4/ip_input.c): http://lxr.free-electrons.com/source/net/ipv4/ip_input.c#l376

the function supposed packet sanity checks, , drop possibly caused wierd packets, im not able verify packets dropped. how can debug / find out why these packets getting dropped?


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