=== LACP retransmit cause investigation (receiver) ===
Host: pfv-tsys6   Role: receiver
Date: 2026-07-27T13:57:50Z
Bond: bond0

--- bond0 hash + driver ---
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
	Number of ports: 2
	Partner Mac Address: 00:13:72:46:95:e4
  nic1     driver=bnx2                 speed=1000   current RX ring=2040
  nic2     driver=bnx2                 speed=1000   current RX ring=2040


--- iperf3 summary ---
[SUM]   0.00-12.00  sec  2.36 GBytes  1.69 Gbits/sec                  receiver

--- TCP SNMP deltas (/proc/net/snmp) ---
  ActiveOpens                   82825 ->        82853  delta=28
  PassiveOpens                  12139 ->        12148  delta=9
  EstabResets                       3 ->            4  delta=1
  InSegs                      4295069 ->      4586141  delta=291072
  OutSegs                     9518841 ->      9761558  delta=242717
  RetransSegs                   68841 ->        68886  delta=45
  OutRsts                        1605 ->         1661  delta=56

--- softnet_stat deltas (look for non-zero dropped_delta/squeezed_delta) ---

--- NIC counter deltas (only non-zero) ---
  [nic1]   sysfs multicast                       38589 ->        38603  delta=14
  [nic2]   sysfs multicast                       16188 ->        16194  delta=6

--- raw iperf3 tail (last 12 lines) ---
[SUM]  12.00-12.00  sec   640 KBytes  1.69 Gbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-12.00  sec   538 MBytes   376 Mbits/sec                  receiver
[  8]   0.00-12.00  sec  81.5 MBytes  57.0 Mbits/sec                  receiver
[ 10]   0.00-12.00  sec  69.4 MBytes  48.5 Mbits/sec                  receiver
[ 12]   0.00-12.00  sec   402 MBytes   281 Mbits/sec                  receiver
[ 14]   0.00-12.00  sec  87.2 MBytes  61.0 Mbits/sec                  receiver
[ 16]   0.00-12.00  sec   538 MBytes   376 Mbits/sec                  receiver
[ 18]   0.00-12.00  sec   378 MBytes   264 Mbits/sec                  receiver
[ 20]   0.00-12.00  sec   327 MBytes   228 Mbits/sec                  receiver
[SUM]   0.00-12.00  sec  2.36 GBytes  1.69 Gbits/sec                  receiver

===================================================================
 HOW TO READ THIS
===================================================================
 - If NIC rx_dropped / rx_missed_errors / rx_fifo_errors climbed:
     -> ring buffers too small. Fix: ethtool -G $IF rx 4096 (or max).
 - If softnet_stat 'dropped' or 'squeezed' climbed on any CPU:
     -> softirq starvation. Fix: increase net.core.netdev_budget,
        check IRQ affinity, consider RPS.
 - If NEITHER of the above climbed but TCP RetransSegs did:
     -> the retransmits are LACP reordering (out-of-order segments
        triggering fast retransmit), NOT packet loss. NOT fixable.
===================================================================
