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SuperThunder/fix_i225_v3_for_good_maybe.md

Last active June 27, 2023 05:34
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Intel i225 v3 NIC low speed issues
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fix_i225_v3_for_good_maybe.md

Problem

Even with the B3 stepping, the Intel i225 is not a fully reliable NIC. It can get very slow speeds for gigabit (eg limited to 75mbps-150mbps) and sometimes negotiate to 100mb instead of gigabit. It can also stop working entirely when dual booting Windows and Linux, requiring a power off.

Things that seemed to improve i225 v3 performance

  • Disable checksum offload for TCP and UDP, IPv4 and v6. This can be found in Device Manager -> Intel i225-V -> right click -> properties -> advanced. This increased performance massively.
  • Setting Maximum number of RSS queues to 1 (probably set to 4) is also meant to help

Other things to try

  • If nothing else is working, fully shut off the PC and disconnect it from power for 30 seconds.
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