![]() ![]() ![]() ![]() In previous Hyper-V versions (Windows Server 2016/2012R2), only hardware Receive Segment Coalescing mode was supported at the NIC level. Network performance is improved because large segments are processed faster than many smaller ones. RSC allows to reduce CPU load and increase network throughput by combining multiple TCP segments into larger ones. ![]() The Receive Segment Coalescing is used at the virtual switch level (vSwitch). Receive Segment Coalescing (RSC) in the Hyper-V vSwitchįirst of all, you should note the Receive Segment Coalescing (RSC) feature that appeared in Hyper-V on Windows Server 2019/2022 (and Windows 10 1809+). In this article, I tried to describe several different methods to improve the network performance of Hyper-V virtual machines running on Windows Server 2019 (and the latest Windows 10 and 11 builds). In some tests, the read/write speed over the network to VM on Windows Server 2019 is almost three times lower than that on WS2016 (copying over SMB, SSH/SCP was tested). Several times I came across a situation when files were copied much slower from/to virtual machines on a Hyper-V host running Windows Server 2019 than in a VM of the same configuration on a host running Windows Server 2016. ![]()
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