I recently had to make some changes to my MythTV box to increase the buffers that the ivtv driver has available to it for the mpeg encoder. I made my change, rebooted the box but had no confirmation in the boot log as to whether or not my options took. Fortunately, the linux /sys filesystem can show you the parameters in use for the kernels active modules, assuming that the driver was coded properly to show that information. In my example, I’m working with the ivtv driver and I set enc_mpg_buffers=16 and enc_vbi_buffers=8.
cat /sys/module/ivtv/parameters/enc_mpg_buffers
16
cat /sys/module/ivtv/parameters/enc_vbi_buffers
8