Re: Reduce CPU usage of PulseAudio on NetBSD

[Onno van der Linden <o.vd.linden%quicknet.nl@localhost>]

On Wed, Dec 23, 2015 at 01:21:17AM +0100, Kamil Rytarowski wrote:
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> 
> The simplest way to reduce >90% CPU usage to <1% on a NetBSD host is
> the following set of two commands (assuming running daemon):
> 
> pacmd "unload-module module-oss"
> pacmd "load-module module-oss mmap=0 device=/dev/audio"
> 
> In general there is an assumption of Linux-like feature to efficiently
> poll(2) mmap'ed region. This operation is very slow on NetBSD.
> 
> This is a temporary walk-around, I will be looking for a permanent one.

Workaround for the pulseaudio package:

--- /usr/pkgsrc/audio/pulseaudio/patches/patch-src_modules_module-detect.c.orig	2015-12-25 10:19:03.000000000 +0100
+++ /usr/pkgsrc/audio/pulseaudio/patches/patch-src_modules_module-detect.c	2015-12-25 10:18:23.000000000 +0100
@@ -14,7 +14,7 @@
 + * And only primary sound device will be used (n=1).
 + */
 +    char args[64];
-+    pa_snprintf(args, sizeof(args), "device=/dev/audio");
++    pa_snprintf(args, sizeof(args), "mmap=0 device=/dev/audio");
 +    if (!pa_module_load(c, "module-oss", args))
 +	exit(1);
 +    n = 1;


Onno