Why does the vmxnet3 driver shipped with RHEL 6 update 2 drops small UDP packets?

Solution Verified - Updated -

Issue

  • After upgrading from RHEL6.1 to 6.2,loadbalancer does not work correctly.Before the upgrade only one LB was active (seen with ipvsadm -L) and used the virtual IP configured for the service. After the upgrade both LB are active (seen with ipvsadm -L) an both show the virtual IP for the configured service.
  • TFTP transfer times out after upgrading the kernel to RHEL 6 update 2
  • After upgrading to RHEL6.2, UDP or heartbeat packets are getting dropped when using vmxnet3 driver
  • vmxnet3 update in RHEL 6.2 broke small UDP packet transmission

Environment

  • RHEL 6 update 2

  • kernel-2.6.32-220.el6.i686 / kernel-2.6.32-220.2.1.el6.x86_64 / kernel-2.6.32-220.el6.x86_64

  • vmxnet3 1.1.18.0-k

  • Vmware ESX Host

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