lkml.org 
[lkml]   [2009]   [Jul]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [2.6.30.1] Significant latency playing video file from NFS4 share
    Date
    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


    \
     
     \ /
      Last update: 2009-07-18 01:33    [W:0.030 / U:0.632 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site