Duplicate TCP ACKs and Retransmissions seen after upgrading from RHEL 5.5 to RHEL 5.8

Solution In Progress - Updated -

Issue

  • There was a brief period where TCP data input to us completely stopped for a few seconds and they saw a very high latency (2 - 4.5 seconds) for about 2 minutes." (This is reoccurring and happening intermittently)
  • When sending to a system running RHEL 5.5 (2.6.18-194.32.1.el5) the system has no dropped packets and so sent no TCP duplicate ACKs and the sender was not required to retransmit
  • When sending to a system running RHEL 5.8 (2.6.18-308.24.1.el5) the system is apparently dropping packets, is sending TCP duplicate ACKs and the sender is required to retransmit

Environment

  • Red Hat Enterprise Linux 5
    • 2.6.18-308.24.1.el5

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