Crackling sound in games, pulseaudio CPU usage high (F10)
Christian Nolte
ch.nolte at noltec.org
Tue Dec 9 10:18:16 UTC 2008
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Mark Eggers schrieb:
> On Tue, 02 Dec 2008 14:20:11 +0000, NM wrote:
>
>> On Mon, 01 Dec 2008 22:31:33 +0000, NMONNET wrote:
>>
>>> Thanks a lot, it seems to be working. ☺
>> Well actually I now get this filling up my messages:
>>
>> Dec 2 15:16:34 ws pulseaudio[30881]: module-alsa-sink.c: ALSA woke us
>> up to write new data to the device, but there was actually nothing to
>> write! Most likely this is an ALSA driver bug. Please report this issue
>> to the PulseAudio developers.
>
>
> First of all, I had to add myself to the pulse-rt group in order to set
> my Gnome sound to the pulse audio server.
>
> I occasionally get these messages. Like you, the frequency increased
> dramatically when I added tsched=0 to my /etc/pulse/default.pa file.
>
> Unfortunately for me, it did not reduce the CPU usage significantly when
> running Audacious configured for pulse audio.
>
> Adding tsched=0 did eliminate popping and crackling when running
> Rhythmbox.
>
> Kaffine is rather strange. When configured to use the GStreamer engine,
> the pulse audio volume monitor shows the client as 'unknown'. When
> configured to use the xine engine, the pulse audio volume monitor shows
> the client as ALSA (expected).
>
> Basically, any music player that appears to use pulse audio directly
> causes pulse audio to use 13% - 16% CPU on a 2 GHz P6 ancient Dell system
> (playing a standard MP3 file).
>
> Attempting to use pulse audio with Xine generates an immediate segfault
> as shown in the /var/log/messages entry below.
>
> xine[25985]: segfault at 0 ip 0072b4dc sp b51bbe30 error 4 in
> libpulse.so.0.7.0[6cf000+6e000]
>
> While I like the concept of pulse audio, there seems to be some
> significant challenges (or at least a lack of understanding on my part).
>
> I'll write up more about my adventures with pulse audio in another
> message.
>
> /mde/
>
Just for the record: These problems are being tracked in redhat bugzilla
[Bug 473080] libpulse segfaults on invalidated **environ
https://bugzilla.redhat.com/show_bug.cgi?id=473080
[Bug 471964] Choppy sound and freeze for rhythmbox
https://bugzilla.redhat.com/show_bug.cgi?id=471964
Best regards,
Christian
- --
"He's an uncontrollable zombie cop from the Mississippi delta. She's a
vivacious mute journalist from aristocratic European stock. They fight
crime!"
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