Sep 27, 2024 · The NIC implements a hash function, and the resulting hash value helps select a CPU. The following figure illustrates the RSS mechanism for determining a CPU. A NIC uses a hashing function to compute a hash value over a defined …

Dec 14, 2021 · The RSS hashing type specifies the portion of received network data that a NIC must use to calculate an RSS hash value. Overlying drivers set the hash type, function, and indirection table. The hash type that the overlying driver sets can be a subset of the type that the miniport driver can support.

Dec 14, 2021 · A NIC or its miniport driver uses the RSS hashing function to calculate an RSS hash value. Overlying drivers set the hash type, function, and table to assign connections to CPUs. For more information, see RSS Configuration. The hashing function can be one of the following: NdisHashFunctionToeplitz; NdisHashFunctionReserved1 ...

Aug 26, 2019 · The RSS hash is a 40/52 byte key used to randomize the distribution of packets over the receive queues. The size of the hash key depends on the hardware of the NIC. Hash Algorithm

Mar 1, 2022 · Receive-side scaling (RSS) is a technique that enables the distribution of arriving packets between multiple RX hardware queues of the network interface card (NIC) using a predefined hash function.

The RSS code is in sys/netinet/in_rss.[ch]. It provides the framework for mapping a given mbuf and RSS hash value to an RSS bucket, which then typically maps to a CPU, netisr context and PCBGROUP. For now the RSS code treats the RSS bucket as the netisr context and PCBGROUP value.

Jan 18, 2019 · Receive side scaling (RSS) is a technology that enables the distribution of received packets between multiple RX queues using a predefined hash function. It enabled multicore CPU to process packets from different queues on different cores.

Dec 3, 2023 · ConnectX4/LX hash is based on Linux standard hashing mechanism with Toeplitz hashing function. The algorithm consists of two parts: 1. Calculation of a hash key per packet. 2. Decision on the right que based on indirection table . Calculation of a hash value per packet. ConnectX4/LX is using Toeplitz hash function in order to calculate the hash ...

Receive Side Scaling (RSS) technology allows spreading incoming traffic between different receive descriptor queues. Assigning each queue to different CPU cores allows better

Nov 4, 2023 · Receive Side Scaling (RSS) technology allows spreading incoming traffic between different receive descriptor queues. Assigning each queue to different CPU cores allows better load balancing of the incoming traffic and improves performance.