On Wed, Dec 01, 2021 at 12:42:05PM -0500, Bruce Fields wrote: > On Wed, Dec 01, 2021 at 09:36:30AM -0500, Bruce Fields wrote: > > OK, good to know. It'd be interesting to dig into where nfsdcltrack is > > spending its time, which we could do by replacing it with a wrapper that > > runs the real nfsdcltrack under strace. > > > > Though maybe it'd be better to do this on a system using nfsdcld, since > > that's what we're transitioning to. > > Trying that on a test VM here, I see each upcall doing 3 fdatasyncs() of > an sqlite-journal file. On my setup, each of those is taking a few > milliseconds. I wonder if it an do better. If I understand the sqlite documentation correctly, I *think* that if we use journal_mode WAL with synchronous FULL, we should get the assurances nfsd needs with one sync per transaction. --b.
