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Date: Tue, 21 Jul 2009 19:31:48 +0200 From: Frans Pop <elendil@...net.nl> To: Trond Myklebust <trond.myklebust@....uio.no> Cc: linux-nfs@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org Subject: Re: [2.6.30.1] Significant latency playing video file from NFS4 share Any suggestions based on the data below? Is the problem maybe that the amount of data transferred each time is so big that the network speed becomes a bottleneck and causes the latency? I can reproduce the issue with both a 10MBit wired link and with a 54MBit wireless link. Is this a kernel bug or a configuration issue? Thanks, FJP On Saturday 18 July 2009, Frans Pop wrote: > 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)
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