On Tue, Apr 02, 2019 at 09:51:42PM +0000, Trond Myklebust wrote: > On Tue, 2019-04-02 at 15:41 -0400, J. Bruce Fields wrote: > > On Tue, Apr 02, 2019 at 01:26:19PM -0400, Bradley C. Kuszmaul wrote: > > > My simple model of metadata operations is to untar something like > > > the linux sources. > > > > > > Each file incurs a LOOKUP, CREATE, SETATTR, and WRITE, each of > > > which > > > is fairly high latency (even the WRITE ends up being done > > > essentially synchronously because tar closes the file after its > > > write(2) call.) > > > > An ordinary file write delegation can help with some of that. > > > > > I guess directory delegations might save the cost of LOOKUP. > > > > > > Is there any hope for getting write delegations? > > > > > > What other steps might be possible? > > > > Trond, wasn't there a draft describing your idea that a server should > > be > > able to grant a write delegation on create and delay the sync? I > > can't > > find it right now. > > > Do you mean this one? > https://tools.ietf.org/html/draft-haynes-nfsv4-delstid-00 Maybe it's too subtle for me. What's the part that allows delaying sync on create? --b.
