Conexant CX23880 suspected driver memory leak

Hi All,

Whilst helping in the development of me-tv:

http://launchpad.net/me-tv/

it was discovered that there was a memory leak that uses up memory at an approximate rate of 1Mb per 5min.

This cam be duplicated by simply using the me-tv (or klear) application and in my case the winfast DVT2000H card and using the gnome system monitor, the memory usage rises steadily and linearly.

It became apparent that the problem was driver based as some people were using different devices and weren't experiencing the same problems.

The kernel details are as follows:

    dv@StudioMachine:~/.me-tv$ uname -r
    2.6.22-14-generic
    running Ubuntu 7.10

The device details are:

    root@StudioMachine:/home/dv# lspci |grep CX
    00:0b.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI 
Video and Audio Decoder (rev 05)
    00:0b.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and 
Audio Decoder [Audio Port] (rev 05)
    00:0b.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and 
Audio Decoder [MPEG Port] (rev 05)

The following are excerpts from the discussion with the me-tv development team:

It was initially thought that the problem started with version
0.5.25 so I did some testing this morning on channel 10 (Standard Definition without EPG started) and found the following:

I recompiled v 0.5.23 and v 0.5.24 and tested them by watching the
gnome system monitor, at no time did the Memory usage go down during the test.

0.5.23

      Time   Memory usage

      11:05    26.5MB
      11.20    28.9MB
      11:30    31.3MB

0.5.24

      10:05    25.8MB
      10:20    30.6MB


    Now the interesting thing is I also tested Klear 0.6 (distro 

provided binaries) and got the following results:

klear v0.6

      11:50    24.0MB
      12:20    29.0MB
      12:35    31.4MB

To me this proves to problem lies elsewhere either in the Xine code
or my suspicion is in the driver code, This would explain why it isn't showing in up on some people's systems

The following test isolates the fault from the me-tv application and any code above the drivers:

If you put a recorded file at ~/.me-tv/test.ts and change your frontend device to some path (in me-tv.config) to a path that does not exist then Me TV will fail to open the device and then try to play ~/.me-tv/test.ts. This will completely bypass the DVB device and you should be able to determine if the driver is at fault.

I tested the application for an hour and the memory usage stayed at a steady 14.6 Mb, given the previous tests I would have expected the memory usage to rise to approx 26.6 Mb

thanks Darrin Ritter

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Thanks Darrin.

I'll fix it if you can prove the leak with dvbstream.

http://sourceforge.net/projects/dvbtools/

Can you?

- Steve

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Hi Steve,

Ill need to Read The Friendly Manual and get back to you. (I'm going into a busy couple of days so it may take some time)

I appreciate the prompt reply

thanks Darrin

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Hi Steven.

Thanks for your willingness to look into my concern. I was unable to find any sign of memory usage increase with dvbstream, actually it stayed a rock steady 144kb there seems to be some sort of randomness to the problem somewhere in the software stack.

Thanks to all who developed the CX23880 driver

Darrin Ritter

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