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Date: Sat, 18 Jul 2009 01:31:11 +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
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
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