Thanks for the quick response! On Saturday 18 July 2009, Trond Myklebust wrote: > Have you tried running nfs-iostat from the nfs-utils package to try and > figure out what the latency is on each READ request from the client? > > You need to run something like > > nfs-iostat --page 20 10 /src/<mountpoint> > > while running the vlc app. $ ../nfs-iostat.py --page 20 10 /srv/fjp/david Note: The mount point selection could be improved. I first had a trailing slash after the mount point and that resulted in all mounts being included in the output. Removing the slash helped. elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.65 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.406 101.661 250.613 0 (0.0%) 1211.745 1222.640 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 13 nfs_readpage() calls read 13 pages 1417 nfs_readpages() calls read 971428 pages (685.6 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 18760 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.25 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.100 0.426 4.262 0 (0.0%) 6.000 6.000 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 2 nfs_readpages() calls read 2 pages (1.0 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.80 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.750 192.196 256.262 0 (0.0%) 1998.933 1999.200 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 1 nfs_readpages() calls read 960 pages (960.0 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.00 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 0 nfs_readpages() calls read 0 pages 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.85 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.750 192.196 256.262 0 (0.0%) 1927.467 1927.467 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 1 nfs_readpages() calls read 960 pages (960.0 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.00 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 0 nfs_readpages() calls read 0 pages 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.85 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.750 192.196 256.262 0 (0.0%) 1930.933 1931.467 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 1 nfs_readpages() calls read 960 pages (960.0 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 5 nfs_writepages() calls wrote 0 pages (0.0 pages per call) elrond:/david mounted on /srv/fjp/david: op/s rpc bklog 0.15 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.100 0.426 4.262 0 (0.0%) 6.000 6.000 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) 0.000 0.000 0 nfs_readpage() calls read 0 pages 2 nfs_readpages() calls read 2 pages (1.0 pages per call) 0 nfs_updatepage() calls 0 nfs_writepage() calls wrote 0 pages 6 nfs_writepages() calls wrote 0 pages (0.0 pages per call) Cheers, FJP -- 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