TECH Signal 583 3 feeds carried it
Disabling Large Send Offload V2 (IPv4) raises iperf3 from 313 Mbit/s to 7.03 Gbit/s on this machine
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A 10GbE homelab network stuck at 313 Mbit/s reached 7.03 Gbit/s after disabling Large Send Offload V2 for IPv4 on an Intel E610-XT2 adapter.
Network performance issues can be caused by offload settings that are normally beneficial. Isolating the network with iperf3 before blaming storage is a key debugging step. This case shows that a single NIC setting can have a dramatic effect, but the fix is not universally applicable.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Increasing receive buffers from 512 to 4096 reduced discarded packets and raised receive throughput from 1.33 to 5.15 Gbit/s.
Disabling Large Send Offload V2 (IPv4) raised iperf3 from 313 Mbit/s to 7.03 Gbit/s in the same test.
The author cautions that LSO is normally useful and this is not advice to disable it everywhere.
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