hi,
on linux we are losing packets too.
should get 77515 udp and got 77500 (datagram_received)
2016-06-10 07:58:31,115 [INFO] [573]
__________________________________________
2016-06-10 07:58:31,116 [INFO] [574]
2016-06-10 07:58:31,116 [INFO] [575] Total udp from fns: 77500 , queue
size: 0
2016-06-10 07:58:31,121 [INFO] [469] Got 77500 json report from
elasticsearch
statistics on ethernet:
[root@localhost ~]# ethtool -S em2
NIC statistics:
rx_bytes: 66615299
rx_error_bytes: 0
tx_bytes: 54350283
tx_error_bytes: 0
rx_ucast_packets: 203121
rx_mcast_packets: 0
rx_bcast_packets: 25
tx_ucast_packets: 125729
tx_mcast_packets: 28
tx_bcast_packets: 1
tx_mac_errors: 0
tx_carrier_errors: 0
rx_crc_errors: 0
rx_align_errors: 0
tx_single_collisions: 0
tx_multi_collisions: 0
tx_deferred: 0
tx_excess_collisions: 0
tx_late_collisions: 0
tx_total_collisions: 0
rx_fragments: 0
rx_jabbers: 0
rx_undersize_packets: 0
rx_oversize_packets: 0
rx_64_byte_packets: 676
rx_65_to_127_byte_packets: 62807
rx_128_to_255_byte_packets: 24
rx_256_to_511_byte_packets: 93093
rx_512_to_1023_byte_packets: 46522
rx_1024_to_1522_byte_packets: 24
rx_1523_to_9022_byte_packets: 0
tx_64_byte_packets: 152
tx_65_to_127_byte_packets: 732
tx_128_to_255_byte_packets: 321
tx_256_to_511_byte_packets: 62227
tx_512_to_1023_byte_packets: 62165
tx_1024_to_1522_byte_packets: 161
tx_1523_to_9022_byte_packets: 0
rx_xon_frames: 0
rx_xoff_frames: 0
tx_xon_frames: 0
tx_xoff_frames: 0
rx_mac_ctrl_frames: 0
rx_filtered_packets: 943
rx_ftq_discards: 0
rx_discards: 0
rx_fw_discards: 0
+++
cpu/mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2627 root 20 0 80364 56304 3368 S 4.0 1.7 2:20.95 python
and packet size are allways ,len 411 or 506 bytes:
08:10:58.770917 IP 10.52.33.139.59999 > 10.52.39.144.58634: UDP, length 411
08:10:58.776343 IP 10.52.33.139.59999 > 10.52.39.144.58634: UDP, length 506
this buffer:
rx_256_to_511_byte_packets: 93093
++++
and it is clear that kernel will start dropping if application not able to
receive , after start recording to text file (putty session) , then tcpdump
will start losing packets.
[root@localhost ~]# tcpdump -i em2 -f "port 59999 and len > 100"
2384 packets captured
3004 packets received by filter
612 packets dropped by kernel
[root@localhost ~]#
regards!
Valdemar
