ifgrp 顺序分发导致的网络性能差

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Category:: ontap-9

Specialty:: perf

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适用于

ONTAP 9
具有顺序分布的接口组

问题

高操作延迟和较差的网络吞吐量
在数据包跟踪中明显存在大量 TCP 乱序帧（> 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