[alsa-devel] snd_dummy on Centos - Redhat

[Takashi Iwai]

At Thu, 3 Sep 2009 17:26:18 +0200,
Giovanni Maruzzelli wrote:
> 
> On Thu, Sep 3, 2009 at 5:12 PM, Giovanni
> Maruzzelli<gmaruzz.lists at gmail.com> wrote:
> >
> > I'll do it and report
> >
> 
> I put hrtimer=0
> 
> I put the printk immediately after the spin_unlock, just before
> return, this is a some second run (gave me bad behavior, as before,
> maybe worst):
> 
> 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...


Takashi