Traffic is exchange market data (mcast) and orders (tcp/ip sockets). Not really observing any mcast drops -- just the retransmits.
Nothing reported by ethtool as far as drops or errors:
$ ethtool -S p6p1 | egrep "drop|error"
rx_errors: 0
rx_dropped: 0
rx_length_errors: 0
rx_over_errors: 0
rx_crc_errors: 0
rx_in_range_length_error: 0
rx_out_range_length_error: 0
tx_errors: 0
tx_dropped: 0
vport_rx_dropped: 0
vport_rx_errors: 0
vport_tx_errors: 0
However netstat does show 1110 retransmits:
$ netstat -s -t
IcmpMsg:
InType0: 2
InType3: 766
InType8: 1508427
OutType0: 1508427
OutType3: 24
OutType8: 2
Tcp:
28205 active connections openings
7703 passive connection openings
27735 failed connection attempts
418 connection resets received
3 connections established
81427948 segments received
82636409 segments send out
1110 segments retransmited
0 bad segments received.
50958238 resets sent
UdpLite:
TcpExt:
9 resets received for embryonic SYN_RECV sockets
6 ICMP packets dropped because they were out-of-window
2491 TCP sockets finished time wait in fast timer
43268 delayed acks sent
5 delayed acks further delayed because of locked socket
Quick ack mode was activated 190 times
1153598 packet headers predicted
20206398 acknowledgments not containing data payload received
8952633 predicted acknowledgments
28 times recovered from packet loss by selective acknowledgements
3 congestion windows recovered without slow start by DSACK
3 congestion windows recovered without slow start after partial ack
91 fast retransmits
8 forward retransmits
1 retransmits in slow start
113 other TCP timeouts
TCPLossProbes: 8417
TCPLossProbeRecovery: 7361
182 DSACKs sent for old packets
8203 DSACKs received
2 connections reset due to early user close
20 connections aborted due to timeout
TCPDSACKIgnoredNoUndo: 7236
TCPSackShifted: 17
TCPSackMerged: 270
TCPSackShiftFallback: 431
TCPRcvCoalesce: 8072
TCPOFOQueue: 2713
TCPChallengeACK: 1
IpExt:
InMcastPkts: 202601225
OutMcastPkts: 3333506
InBcastPkts: 1601703
OutBcastPkts: 51907
InOctets: -296076664
OutOctets: 333771574
InMcastOctets: -1675581420
OutMcastOctets: 234205568
InBcastOctets: 212090513
OutBcastOctets: 6644676
InNoECTPkts: 292708838