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Regression #12873

closed

Hyper-V RSC support in ``hn(4)`` driver is enabled by default and results in very low throughput

Added by Steve Wheeler about 2 years ago. Updated almost 2 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Category:
Hardware / Drivers
Target version:
2.7.0
Start date:
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
22.05
Release Notes:
Default
Affected Version:
2.6.0
Affected Architecture:
amd64

Description

RSC support was added to FreeBSD in 12.3 and is included in pfSense 22.01/2.6.

When run in Hyper-V it can create very low throughput in some conditions. That can be mitigated in some setups by disabling RSC in the vSwitches but not all.

RSC should be disabled when the system is routing but is not automatically and the current driver implementation provides no way to disable it manually.

See: https://forum.netgate.com/topic/169884/after-upgrade-inter-v-lan-communication-is-very-slow-on-hyper-v

And: https://reviews.freebsd.org/D29075?id=85183#771753

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