svn commit: r351847 - head/sys/dev/sound/pcm

[Hans Petter Selasky]

Author: hselasky
Date: Thu Sep  5 10:49:12 2019
New Revision: 351847
URL: https://svnweb.freebsd.org/changeset/base/351847

Log:
  Decrease the default audio playback latency to a maximum of 21.3ms.
  This significantly improves the audio playback response time.
  
  Discussed with:	mav@
  MFC after:	1 week
  Sponsored by:	Mellanox Technologies

Modified:
  head/sys/dev/sound/pcm/channel.h

Modified: head/sys/dev/sound/pcm/channel.h
==============================================================================
--- head/sys/dev/sound/pcm/channel.h	Thu Sep  5 09:57:20 2019	(r351846)
+++ head/sys/dev/sound/pcm/channel.h	Thu Sep  5 10:49:12 2019	(r351847)
@@ -413,7 +413,7 @@ extern int report_soft_matrix;
 
 #define CHN_LATENCY_MIN		0
 #define CHN_LATENCY_MAX		10
-#define CHN_LATENCY_DEFAULT	5
+#define	CHN_LATENCY_DEFAULT	2	/* 21.3ms total buffering */
 #define CHN_POLICY_MIN		CHN_LATENCY_MIN
 #define CHN_POLICY_MAX		CHN_LATENCY_MAX
 #define CHN_POLICY_DEFAULT	CHN_LATENCY_DEFAULT