Hi David, On Tue, 12 Mar 2019, David Howells wrote: > > My /usr/local/src mount was mounted with vers=4.2 (default), while > > nfstest_cache was mounting its test-mount with vers=4.1! Apart from the > > different rsize/wsize values, the version number stood out. And indeed, > > when I mount my regular NFS mount /usr/local/src with vers=4.1, the > > "duplicate cookie" is no longer printed. > > Yeah - NFS superblocks are differentiated by a whole host of parameters, > including protocol version number, and caches aren't shared between > superblocks because this introduces a tricky coherency problem. > > The issue is that NFS superblocks to the same place do not currently manage > coherency (inode attributes, data) between themselves, except via the server. > > However, if "fsc" isn't given on the mount commandline, the superblock > probably shouldn't get a server-level cookie if we can avoid it.
Just checking - are you waiting for new results from me, should I test something that I missed? Or are new patches in the works? :-D Thanks, Christian. -- BOFH excuse #139: UBNC (user brain not connected)
