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. --b.
