On Wed, 2010-12-08 at 14:36 -0800, Simon Kirby wrote: > On Wed, Dec 08, 2010 at 04:53:09PM -0500, Trond Myklebust wrote: > > > Possibly a side effect of the fs/fs-writeback.c changes in 2.6.36? You > > do appear to be hitting a lot of spinlock contention, but I suspect that > > a lot of it is coming from writeback_sb_inodes, writeback_single_inode > > and queue_io, all of which seem unnaturally high on your stats above. > > > > I don't see how you can be seeing no traffic on the wire. You are > > certainly hitting some page writeout (0.2% nfs_pageio_doio). > > It really seems to not be doing anything. I ran nfsstat -Zcv for 5 > minutes, and the only non-zero counters are rpc calls and authrefrsh, > even though perf top shows similar profiles the whole time. That sounds like a bug in nfsstat, then. As I said, your trace results definitely indicate that you are doing page writeout. I'd cross check using wireshark... Cheers Trond -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@xxxxxxxxxx www.netapp.com -- 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
