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Cisco Bug: CSCvt74893 - FMCv Ethernet driver indicates vmxnet3 TCP performance compromised

Last Modified

Aug 31, 2020

Products (11)

  • Sourcefire Defense Center
  • Cisco Firepower Management Center 4600
  • Cisco Firepower Management Center 2500
  • Cisco NGIPS Virtual Appliance
  • Cisco Firepower Management Center 4500
  • Cisco Firepower Management Center 4000
  • Cisco Firepower Management Center 1600
  • Cisco Firepower Management Center 1000
  • Cisco Firepower Management Center 2600
  • Cisco Firepower Management Center Virtual Appliance
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Known Affected Releases

6.5.0 6.7.0

Description (partial)

Symptom:
A virtual FMC unit can print the following Linux kernel message to the console when the virtual FMC is configured to used the vmxnet3 Ethernet device for the Management Ethernet port.

TCP: eth0: Driver has suspect GRO implementation, TCP performance may be compromised.

While this message means that it is possible that the Ethernet Management port TCP performance may not be optimal there no operational problems.

Conditions:
A virtual FMC unit is configured to us the vmxnet3 Ethernet port.
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Bug Details Include

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