Loading ...
Sorry, an error occurred while loading the content.

Re: C-Media USB audio has dropouts, stutter, and static

Expand Messages
  • pinforest
    I performed the tests described below using the serial console with madplay --no-tty-control -r my.mp3 running in the background. my.mp3 is located on a
    Message 1 of 4 , Jan 27, 2009
    • 0 Attachment
      I performed the tests described below using the serial console with
      'madplay --no-tty-control -r my.mp3' running in the background.
      'my.mp3' is located on a 1.0GB USB flash drive. The results are
      similiar to the Samba tests I ran a few days ago.

      The bonnie++ tests were done on a directory located on the same flash
      drive as 'my.mp3' and the output is below. Running bonnie++ while the
      mp3 was playing I heard no dropouts.

      Running iperf in server mode ('iperf -s') on the DSM-G600 didn't
      cause the audio to dropout. The output from both the client & server
      are below.

      Running iperf in client mode ('iperf -c') on the DSM-G600 did cause
      the audio to dropout. The output from both the client & server are
      below.

      Any help is greatly appreciated.

      Thanks!

      ---

      bonnie++ -d /bonnie -s 128 -n 4
      Writing with putc()...done
      Writing intelligently...done
      Rewriting...done
      Reading with getc()...done
      Reading intelligently...done
      start 'em...done...done...done...
      Create files in sequential order...done.
      Stat files in sequential order...done.
      Delete files in sequential order...done.
      Create files in random order...done.
      Stat files in random order...done.
      Delete files in random order...done.
      Version 1.03c ------Sequential Output------ --Sequential Input-
      --Random-
      -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
      --Seeks--
      Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec
      %CP /sec %CP
      MASK 128M 781 78 4045 30 2949 17 855 80 11157
      25 84.6 4
      ------Sequential Create------ --------Random
      Create--------
      -Create-- --Read--- -Delete-- -Create-- --Read---
      -Delete--
      files /sec %CP /sec %CP /sec %CP /sec %CP /sec
      %CP /sec %CP
      4 295 79 +++++ +++ 5187 81 299 79 +++++ ++
      + 1061 78
      MASK,128M,781,78,4045,30,2949,17,855,80,11157,25,84.6,4,4,295,79,++++
      +,+++,5187,81,299,79,+++++,+++,1061,78

      ---

      'iperf -s' on the DSM-G600
      ------------------------------------------------------------
      Server listening on TCP port 5001
      TCP window size: 85.3 KByte (default)
      ------------------------------------------------------------
      [ 4] local 192.168.1.2 port 5001 connected with 192.168.1.3 port 3019
      [ 4] 0.0-10.0 sec 21.2 MBytes 17.8 Mbits/sec

      'iperf.exe -c MASK'
      ------------------------------------------------------------
      Client connecting to 192.168.1.2, TCP port 5001
      TCP window size: 8.00 KByte (default)
      ------------------------------------------------------------
      [1912] local 192.168.1.3 port 3019 connected with 192.168.1.2 port
      5001
      [ ID] Interval Transfer Bandwidth
      [1912] 0.0-10.0 sec 21.2 MBytes 17.8 Mbits/sec

      ---

      'iperf -c OTHERMASK'
      ------------------------------------------------------------
      Client connecting to 192.168.1.3, TCP port 5001
      TCP window size: 16.0 KByte (default)
      ------------------------------------------------------------
      [ 3] local 192.168.1.2 port 55515 connected with 192.168.1.3 port
      5001
      [ 3] 0.0-10.0 sec 14.3 MBytes 12.0 Mbits/sec

      'iperf.exe -s'
      ------------------------------------------------------------
      Server listening on TCP port 5001
      TCP window size: 8.00 KByte (default)
      ------------------------------------------------------------
      [1880] local 192.168.1.3 port 5001 connected with 192.168.1.2 port
      55515
      [ ID] Interval Transfer Bandwidth
      [1880] 0.0-10.0 sec 14.3 MBytes 12.1 Mbits/sec
    Your message has been successfully submitted and would be delivered to recipients shortly.