Last Modified: Nov 25, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0
Opened: Oct 17, 2025 Severity: 3-Major
TCP retransmits occur on Hyper-V deployments with Cisco VIC networks (SR-IOV disabled). The problem is related to large segments processing (TSO packets)
Poor TCP performance for virtual servers with TCP profile
- Hyper-V VM with Network adapter on top of Cisco VIC interface - SR-IOV is not enabled - Virtual server uses TCP profile
- Disable TSO feature: tmsh modify sys db tm.tcpsegmentationoffload value disable - Other workaround is to switch to sock driver: https://my.f5.com/manage/s/article/K000153024
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