Network Adapter Settings for Maximizing throughput

11. Large Send Offload V2 (IPv4) and Large Send Offload V2 (IPv6)

Crutledge explains this concept beautifully in his post Large Send Offload and Network Performance (A good read!). The idea is that the TCP/IP software stacks buffers data messages before sending them to the Ethernet adapter. The adapter itself then segments it into smaller chunks that fit into the frame size (normally 1500bytes, or, if you set Jumbo Frames, they will be that size instead.) using an algorithm implemented in its hardware (super fast!).

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Crutledge then explains that this frees up CPU “from having to handle segmenting of large TCP messages into smaller packets”.

He goes on to explain that problems start because different network devices have to agree on the same frame size.

If a switch does not support the Jumbo Frame Size it silently drops the frame. The idea is that without the buffering introduced by LSO, smaller packets would be sent into the network that is more likely to be accepted by routes and switched because of their standard size. To quote him again, “And this is where a performance enhancement feature becomes a performance degradation nightmare”.

I encourage you to read his article (it’s relatively short and concise) to find out more about this.

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12. Locally Administered Address

This allows you to set a static IP address for this machine. I leave this disabled to assign IP’s automatically. My router at home does a good job of assigning the same IP based on MAC addresses anyway.

13. Log Link State Event

When enabled the Ethernet adapter will log all state changes in a file. In a home network, I don’t see any reason why you would want to read those logs. To reduce CPU overhead (however small that may be) I would just disable this feature.

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14. Maximum Number of RSS Queues

15. Packet Priority & VLAN

16. Protocol ARP Offload

17. Protocol NS Offload

18. Receive Buffer MAX

19. Receive Side Scaling

Recommended Setting: Disabled Effect on Throughput: Effect on CPU Utilisation:

This involves the distribution of incoming network processing across multiple processor cores. For example, multiple TCP connections are created to load different elements on a website. These connections are distributed across different cores to improve performance. Does not affect throughput, only CPU utilisation. Network benchmark tools may show that total performance decreases when this tool is enabled. Users who care about CPU utilisation are encouraged to enable this feature, otherwise, leave it disabled.

20. Reduce Speed on Power Down

If you are concerned about energy consumption over performance, enable this feature. Otherwise disable it.