On Mon, Oct 17, 2011 at 09:53:37AM +0200, Harald Dunkel wrote: > Hi folks, > > I did a brief test on a local nfs server: Extracting the > linux kernel sources on a nfs partition it seems that nfs3 > is 30% faster than nfs4. For nfs3 I got 5.2MB/sec. Nfs4 > gave me just 3.8MB/sec. The server was idle except for this > test. > > Client and server were running 2.6.39 from the Debian backports > repository. I just changed the mount option on the client to > select nfs3 or nfs4. > > I don't want to complain, but I did not expect this huge loss > in performance for moving to nfs4. Any helpful comment would be > highly appreciated. It might be worth looking at /proc/self/mountstats and seeing if you can figure out where the time's going in the v4 case. (Probably open/close?) That workload is unlikely to be bandwidth-limited so total time is probably the better number to look at instead of bandwidth. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
