RHEL7 VM network performance degraded after update to Hyper-V 2019

Solution Verified - Updated -

Issue

  • hv_netvsc throughput drastically degraded after update to Hyper-V 2019
  • Microsoft LIS 4.3.4 and newer included add-on drivers, not supported by Red Hat, do not exhibit degraded network performance in Hyper-V 2019

Environment

  • Red Hat Enterprise Linux 7 (RHEL7)
  • hv_netvsc
  • Receive Segment Coalescing (RSC) is enabled in vSwitch.

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