OpenWrt NIC Drivers

The repository is for building the Realtek 8125b & Intel IGB drivers for OpenWrt stock firmwares

Receive Side Scaling (RSS)

When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. Without RSS, all of the processing is performed by a single processor, resulting in inefficient system cache utilization.

You can check how many queues that nic has by ethtool -S eth0.

# two queues here for nic eth0
root@main:~# ethtool -S eth0 | grep queue_
     tx_queue_0_packets: 76237812
     tx_queue_0_bytes: 115366533619
     tx_queue_0_restart: 0
     tx_queue_1_packets: 13284570
     tx_queue_1_bytes: 11170423616
     tx_queue_1_restart: 0
     rx_queue_0_packets: 45949999
     rx_queue_0_bytes: 55390542647
     rx_queue_0_drops: 0
     rx_queue_0_csum_err: 0
     rx_queue_0_alloc_failed: 0
     rx_queue_1_packets: 44304833
     rx_queue_1_bytes: 56510279008
     rx_queue_1_drops: 0
     rx_queue_1_csum_err: 0
     rx_queue_1_alloc_failed: 0

You can check the /proc/interrupts file for RSS queues on intel i211 nic

Realtek RTL8125 / RTL8125B(S)(G)

The RTL8125BG/RTL8125BGS supports Receive-Side Scaling (RSS) to hash incoming TCP connections and load-balance received data processing across multiple CPUs. RSS improves the number of transactions per second and number of connections per second, for increased network throughput.

There is a builtin driver called r8169 that supprt rtl8125b on linux, and I suppose you can't enable the Receive side scaling (RSS) on it, rtl8125b can support 32 queues. This version just enable the RSS.

ENABLE_RSS_SUPPORT = y
ENABLE_MULTIPLE_TX_QUEUE = y
CONFIG_ASPM = n

Intel NICs

I350-based adapters: 8 queues
82575-based adapters: 4 queues
82576-based and newer adapters: 8 queues
I210-based adapters: 4 queues
I211-based adapters: 2 queues

If you have an OpenWrt on a VM(ESXI or PVE) that has I211 nics, just set two cores on it, and enable RSS=2. that's it!

# set RSS to 2 on OpenWrt for two nics
root@main:~# cat /etc/modules.d/35-igb-intel
igb RSS=2,2

How to use it

Download package from https://github.com/csrutil/OpenWrt-NIC-Drivers/releases page, scp into your router and install it.

Notice

Those packages are ONLY for the official stock firmwares

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realtek 8125b 2.5G & intel igb ethernet drivers for stock OpenWrt firmwares

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