[pulseaudio-discuss] PulseAudio Painfully Slow
Alexander E. Patrakov
patrakov at gmail.com
Sun Jul 13 21:31:13 PDT 2014
14.07.2014 02:24, Benny de von Ausfern wrote:
> All the mentioned games run natively, with the exception being Dungeons
> & Dragons Online (which runs fine with ALSA). This is certainly not a
> Wine bug. I want you to understand that "killall -9 pulseaudio"
> immediately solves all the problems, so its nothing but natural to blame
> This is my /proc/cpuinfo: http://pastebin.com/CqccL3qm
> alsa-inf.sh: http://pastebin.com/8zC6fdhh
Looked. Your ALSA configuration is broken.
First, you have a Haswell HDMI audio device in the system. Mere presence
of it in some kernel configurations causes IRQ-related issues that can
delay arbitrary programs for arbitrary amount of time if it is accessed
at least once. This is a known kernel bug, tracked as
https://bugzilla.kernel.org/show_bug.cgi?id=60769 (but for other
reporters it has different manifestations). With pure ALSA, you don't
hit it, because nothing accesses this device even for probing the
Please add this to the kernel command line to work around the kernel bug:
Second, you have overrides of the model that are unnecessary for your
hardware. 6stack is definitely not applicable to Haswell HDMI. So,
remove all snd-hda-intel module parameters.
Please fix the problems above and see whether the game-framerate bug
> Pulseaudio is around 6% usage. When there is a game running, sometimes
> the thing propagates to the WM (Enlightenment DR 18 with all the
> compositions disabled, I don't like them) itself - windows lag when I
> try to move/resize, take longer to open or freeze for a couple of
> seconds without reason. Once again: killing pulseaudio solves it
> IMMEDIATELY. I've never had this behaviour without pulseaudio. As a
> matter of fact, I can play 2 or 3 of those games simultaneously (I have
> 2 screens) with ALSA without any noticeable slowdown.
> top with Audacious playing music: http://pastebin.com/8eBbus7k
> top with Skype (and nothing else going on): http://pastebin.com/DyJ0vJWC
It is not "with nothing else going on" - there is pavucontrol, which
causes PulseAudio to enable the peak meter. And with that, it's
perfectly reasonable for PulseAudio to eat 6% of your CPU.
Alexander E. Patrakov
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