According to the slides from a 2023 Linux Storage, Filesystem, Memory-Management and BPF Summit talk, guests operating through the netkit device (which was called "meta" at that time) are able to attain TCP data-transmission rates that are just as high as can be had by running directly on the host. The performance penalty for running within a guest has, in other words, been entirely removed.
Monday, November 27. 2023
More eBPF
The BPF-programmable network device from lwn.net. The new device, named "netkit", aims to short out some of that overhead. It is, in some sense, a typical virtual device in that a packet transmitted at one end will only pass through the host system's memory before being received at the other.
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