On Thu, 12 Jun 2025, Jeff Layton wrote: > > I've been looking over the code today. Basically, I think we need to > have svc_tcp_recvfrom() receive in phases. At a high level: > > 1/ receive the record marker (just like it does today) Long ago (IETF 47??) I heard someone talking about a "smart" network card that would detect UDP packets to port 2049, split the data into the largest power-of-2 as a final component and the remainder as a header, and DMA them into memory that way. This would very often put the data in page-aligned memory. We could do the same thing here. Currently we copy as much as will fit into the "header" and the rest into the "pages". We could instead use power-of-2 maths to put some in the header and a whole number of pages into the "pages". This would probably work well for NFSv3 and shouldn't make NFSv4 worse It wouldn't provide a guarantee, but could provide a useful optimisation. NeilBrown
