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Traffic loss during policy installation and "Detected Tx Unit Hang" messages in messages file Technical Level
Symptoms
  • Traffic outage is seen during policy installation. Issue happens even during relatively lower traffic hours.
  • Following messages are seen in messages files during the policy install -
    Jul 9 16:09:26 20xx  kernel: [3261783.967373] igb 0000:05:00.3: Detected Tx Unit Hang
    Jul 9 16:09:26 20xx  kernel: [3261783.967373] Tx Queue <0>
    Jul 9 16:09:26 20xx  kernel: [3261783.967373] TDH <0>
    Jul 9 16:09:26 20xx  kernel: [3261783.967374] TDT <0>
    Jul 9 16:09:26 20xx  kernel: [3261783.967374] next_to_use <0>
    Jul 9 16:09:26 20xx  kernel: [3261783.967375] next_to_clean <116>
    Jul 9 16:09:26 20xx  kernel: [3261783.967375] buffer_info[next_to_clean]
    Jul 9 16:09:26 20xx  kernel: [3261783.967376] time_stamp <369be8cf6>
    Jul 9 16:09:26 20xx  kernel: [3261783.967376] next_to_watch 
    Jul 9 16:09:26 20xx  kernel: [3261783.967376] jiffies <369be98bb>
    Jul 9 16:09:26 20xx  kernel: [3261783.967377] desc.status <128001>
  • Increasing tx-ringsize did not help
Solution
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