Hi all,
I am using alsa 0.9.2 on my system, and I have an on-board intel8x0 Analog Devices 1881A SoundMax codec. In my alsa.conf file I have an automatic rate conversion plugin defined as follows:
pcm.intel8x0{
type hw
card 0
}pcm.good_format{
type plug
slave{
pcm intel8x0
format S16_LE
channels 2
rate 44100
}
}To test out this plugin, I compiled the 0.9.2 versions of aplay and amixer. I was able to run amixer and un-mute Master and PCM with no problems. I then ran aplay using the plugin with the following syntax:
./aplay -D good_format <wav file>
In doing this, I was able to attain my goal of being able to play a wav file with any combination of available sample rates, bit rates, and mono/stereo.
However, I did notice something unusual. Each time I ran aplay using the above pcm plugin, I lost 4k of available memory. To find the memory leak culprit, I unloaded all alsa modules and took a snapshot of available memory with 'free'. I then loaded all alsa modules, set the mixer, ran aplay with good_format 5 times, and then unloaded the modules. The 20k of memory that was lost from running aplay 5 times was not returned to the system. This points to the memory leak being in the alsa kernel modules.
As a first sanity check I checked my 'free', loaded the modules, set the mixer, and then unloaded the modules. All memory used for the mixer was returned to the system as expected.
As a second sanity check, I ran the above test substituting the default pcm device (./aplay -D intel8x0 <wav file>) instead of the plugin. There was no memory loss seen after each use of aplay, and all allocated memory was returned to the system as expected.
I have been looking long and hard to find the source of this issue, and I am running out of ideas. Has anyone seen this? Is there really a memory leak in the alsa kernel modules when using an intel8x0 pcm plugin? Or am I doing something wrong? Thanks in advance for your help!
----- Chris Pechie
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