Hi all, If there are any free slots on the filesystem track, then it would be nice to have a conversation about use of FIEMAP and SEEK_HOLE/DATA performance. The issue is this: as large sparse files become more prevalent, there is a potential performance advantage to be made if applications can quickly and easily detect areas of no data. Full disclosure: my interest here is seeing Anna's work on implementing the NFSv4.2 sparse file support come to fruition; right now she is finding that the performance of the filesystem tools (both seekdir() and FIEMAP) are insufficient to allow us to implement the READPLUS (htt ps://tools.ietf.org/html/rfc7862#section-6.2.1) operation and realise the promised performance goals. If there is time left on the schedule, then it might be nice to have a full discussion of this topic with all the filesystem folks present, but if not, we could do it as a lightning talk. Thanks Trond -- Trond Myklebust Linux NFS client maintainer, PrimaryData trond.myklebust@xxxxxxxxxxxxxxx
