On Thu, 2017-03-16 at 16:09 +0000, Trond Myklebust wrote: > 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 > It turns out that we still had one open slot later in the afternoon on Tuesday so I added this there. Cheers, -- Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
