Poor network performance from ifgrp sequential distribution

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Views:: 373

Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

ONTAP 9
Interface Group with sequential distribution

Issue

High operational latency and poor network throughput
High number of TCP Out-Of-Order frames evident in packet trace (> 1%)

 % tshark -r tcpdump_s300.pcap -Y 'tcp.analysis.out_of_order'
    7   0.000051 0.000000000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351561750 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433141
    9   0.000059 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351588910 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433141
   11   0.000067 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351570698 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433141
   13   0.000076 0.000009000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351597858 Ack=971185171 Win=30841 Len=17896 TSval=2423401583 TSecr=2663433141
   15   0.000086 0.000010000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351579646 Ack=971185171 Win=30841 Len=624 TSval=2423401583 TSecr=2663433141
   17   0.000094 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351615754 Ack=971185171 Win=30841 Len=9256 TSval=2423401583 TSecr=2663433141
   28   0.000317 0.000223000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351687214 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433150
   32   0.000344 0.000027000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351696162 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433150
   46   0.000475 0.000131000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351768178 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433150
   48   0.000483 0.000008000 10.0.6.8 10.0.6.6 TCP 2049,978  [TCP Out-Of-Order] 2049 → 978 [ACK] Seq=1351777126 Ack=971185171 Win=30841 Len=8948 TSval=2423401583 TSecr=2663433150