On Thu, Sep 3, 2009 at 5:29 PM, Takashi Iwaitiwai@suse.de wrote:
Sep 3 17:20:20 localhost kernel: giovanni line: 291, dpcm->frac_pos / HZ=0, jiffies=91837395 Sep 3 17:20:20 localhost kernel: giovanni line: 291, dpcm->frac_pos / HZ=48, jiffies=91837398 Sep 3 17:20:20 localhost kernel: giovanni line: 291, dpcm->frac_pos / HZ=48, jiffies=91837398 Sep 3 17:20:20 localhost kernel: giovanni line: 291, dpcm->frac_pos / HZ=80, jiffies=91837400 Sep 3 17:20:20 localhost kernel: giovanni line: 291, dpcm->frac_pos / HZ=80, jiffies=91837400
So, this is a kernel with the variable HZ. That's the whole problem. My patch also doesn't take it into account but assumes the constant HZ. We'll need to convert the stuff to msecs_to_jiffies() and co...
Ah! I was struggling since days on this, you're fast!!!
Also, I saw you made various modifications that I tried to make (in a messy way), to a custom version of snd-dummy made to support 128 subdevices and use less irq and context switches. As soon as you looked into the variable HZ problem, I will see if my modifications still make some sense, and in case I will forward it to you.
Thanks again for your prompt reaction and for taking care of this,
-giovanni