Multi-stage large send offload

摘要

A network stack sends very large packets with large segment offload (LSO) by performing multi-pass LSO. A first-stage LSO filter is inserted between the network stack and the physical NIC. The first-stage filter splits very large LSO packets into LSO packets that are small enough for the NIC. The NIC then performs a second pass of LSO by splitting these sub-packets into standard MTU-sized networking packets for transmission on the network.

主权项

1. A method for transmitting packets over a network, comprising:
receiving at a first operating system operating on a computing device, an indicator of a first large segment offload (LSO) packet size wherein the first LSO packet size is a multiple of a second LSO packet size that is supported by a network interface card connected to the computing device; formatting data into a first packet of a first LSO packet size; transferring the first packet to a second operating system on the same computing device; splitting the first packet on the second operating system into multiple LSO packets of a second LSO packet size; sending the multiple LSO packets to the network interface card for transmission on the network in packets of a size supported by the network.