Post Syndicated from original https://lwn.net/Articles/931668/

In a plenary session on the first day of the 2023 Linux Storage, Filesystem,
Memory-Management and BPF Summit,
Stephen Bates led a discussion about peer-to-peer DMA (P2PDMA). The idea is to
remove the host system’s participation in a transfer of data from one
PCIe-connected device to another. The feature was originally aimed at NVMe
SSDs so that data could simply be copied directly to and from the storage
device without needing to move it to system memory and then from
there to somewhere else.