From: Frans Pop <elendil-EIBgga6/0yRmR6Xm/wNWPw@public.gmane.org>
To: Trond Myklebust
<trond.myklebust-41N18TsMXrtuMpJDpNschA@public.gmane.org>
Cc: linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [2.6.30.1] Significant latency playing video file from NFS4 share
Date: Sat, 18 Jul 2009 01:31:11 +0200 [thread overview]
Message-ID: <200907180131.12586.elendil@planet.nl> (raw)
In-Reply-To: <1247871086.4945.38.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
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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next prev parent reply other threads:[~2009-07-17 23:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-17 20:50 [2.6.30.1] Significant latency playing video file from NFS4 share Frans Pop
2009-07-17 22:51 ` Trond Myklebust
[not found] ` <1247871086.4945.38.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-07-17 23:31 ` Frans Pop [this message]
[not found] ` <200907180131.12586.elendil-EIBgga6/0yRmR6Xm/wNWPw@public.gmane.org>
2009-07-21 17:31 ` Frans Pop
[not found] ` <200907211931.50015.elendil-EIBgga6/0yRmR6Xm/wNWPw@public.gmane.org>
2009-07-21 17:58 ` Trond Myklebust
[not found] ` <1248199105.21343.16.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2009-07-21 21:54 ` Frans Pop
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