[alsa-devel] Which project to choose?

[Raymond Yau]

2010/7/16 Jaroslav Kysela <perex at perex.cz>

> On Thu, 15 Jul 2010, Chris wrote:
>
> > On Thu, 2010-07-15 at 16:07 +0200, Jaroslav Kysela wrote:
> >> On Thu, 15 Jul 2010, Colin Guthrie wrote:
> >>
> >>> 'Twas brillig, and Chris at 15/07/10 02:38 did gyre and gimble:
> >>>> On Thu, 2010-07-15 at 08:08 +0800, Raymond Yau wrote:
> >>>>
> >>>>>> I posted both of those bug reports. Honestly, I just want it to work
> >>>>>> without all the error output to syslog and thrashing of my HD for
> >>>>>> minutes at a time. As I said, I've got the output of pulseaudio
> -vvvvv
> >>>>>> if anyone would like to look at it and tell me what I need to do to
> fix
> >>>>>> the problem.
> >>>>>>
> >>>>>> Chris
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> Just upload your current pulseaudio.log and output of alsa-info.sh to
> >>>>> mandriva 's bugzilla
> >>>>>
> >>>>> Cannot obtain any conclusion based on the log which you have posted
> last
> >>>>> year ( xmms)
> >>>>>
> >>>>> as Jaroslav Kysela said , need the real system time between I/O
> operations
> >>>>> and you'll see if it's issue in the ALSA driver or a task scheduling
> >>>>> problem.
> >>>>
> >>>> Here is the bug report with the outputs uploaded.
> >>>>
> >>>> https://qa.mandriva.com/show_bug.cgi?id=60169
> >>>
> >>> Well seeing as my process when getting such a bug is to report it here
> >>> on behalf of the user, I suspect that this has reached a stalemate....
> >>
> >> Please, provide also /var/log/messages output for xrun_debug=11 - see
> >> http://www.alsa-project.org/main/index.php/XRUN_Debug for more details.
> We
> >> can detect the ALSA ring buffer issues in this way, too.
> >>
> >>                                              Jaroslav
> >>
> > See pastebin file http://pastebin.com/MdENbSNd
> > Hopefully I did this correctly.
>
> Thanks. The hardware ring buffer pointers looks OK so it does not appear
> like a problem in our ALSA code. I would really consult these problems
> with PulseAudio developers. Return back, if they say that it's really
> ALSA issue, not the system scheduler issue.
>
> Note that for your configuration, you have the ring buffer containing only
> 0.1 second (it means that standard underruns can happen more frequently
> - usuall symptom is for example moving a window in X GUI).
>
>                                                Jaroslav
>
>
Refer to the log , the values of pos and hwptr seem multiple of 8


5.5 PCI Data transfer

Only brust read/write transfers are allowed. All data transfer are 8 Long
Word brust transfers

This mean that the driver may need to limit the period bytes to be multiple
of 8 Long Word since interrupt occur when a cache fill/transfer between the
PCI memory and the internal memory.

snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);


and you may also need to set "rewind_safeguard" in PA too.


http://git.0pointer.de/?p=pulseaudio.git;a=commit;h=4df443bbe682055a41e7c2248877dcc7682a69b8