XRUN Debug - Revision history

Perex at 14:06, 15 July 2010

2010-07-15T14:06:25Z

@@ Line 21: / Line 21: @@
    # Usefull to just see, if PCM stream is stopped for a reason (usually wrong audio process timing from scheduler)
    echo 3 > /proc/asound/card0/pcm0p/xrun_debug
    # Enable basic debugging, do jiffies check and enable one shot dump of last 10 ring buffer positions

Perex at 06:20, 14 April 2010

2010-04-14T06:20:44Z

← Older revision		Revision as of 06:20, 14 April 2010
Line 7:		Line 7:
	1 Basic debugging - show xruns in ksyslog interface		1 Basic debugging - show xruns in ksyslog interface
	2 Dump stack - dump stack for basic debugging		2 Dump stack - dump stack for basic debugging
	4 Jiffies check - compare the position with kernel jiffies (a sort of in-kernel monotonic clock), show what's changed when basic debugging is enabled		4 Jiffies check - compare the position with kernel jiffies (a sort of in-kernel monotonic clock),
			show what's changed when basic debugging is enabled
	8 Dump positions on each period update call		8 Dump positions on each period update call
	16 Dump positions on each hardware pointer update call		16 Dump positions on each hardware pointer update call

Perex at 18:30, 11 March 2010

2010-03-11T18:30:21Z

← Older revision		Revision as of 18:30, 11 March 2010
Line 3:		Line 3:
	===/proc/asound/card#/pcm0p/xrun_debug===		===/proc/asound/card#/pcm0p/xrun_debug===

	Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG, ~~SND_VERBOSE_PROCFS~~, CONFIG_SND_DEBUG options must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).		Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG, CONFIG_SND_VERBOSE_PROCFS, CONFIG_SND_DEBUG options must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).

	1 Basic debugging - show xruns in ksyslog interface		1 Basic debugging - show xruns in ksyslog interface

Perex at 18:30, 11 March 2010

2010-03-11T18:30:08Z

← Older revision		Revision as of 18:30, 11 March 2010
Line 3:		Line 3:
	===/proc/asound/card#/pcm0p/xrun_debug===		===/proc/asound/card#/pcm0p/xrun_debug===

	Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG ~~and~~ CONFIG_SND_DEBUG options must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).		Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG, SND_VERBOSE_PROCFS, CONFIG_SND_DEBUG options must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).

	1 Basic debugging - show xruns in ksyslog interface		1 Basic debugging - show xruns in ksyslog interface

Perex at 18:28, 11 March 2010

2010-03-11T18:28:46Z

← Older revision		Revision as of 18:28, 11 March 2010
Line 3:		Line 3:
	===/proc/asound/card#/pcm0p/xrun_debug===		===/proc/asound/card#/pcm0p/xrun_debug===

	Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG ~~option~~ must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).		Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG and CONFIG_SND_DEBUG options must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).

	1 Basic debugging - show xruns in ksyslog interface		1 Basic debugging - show xruns in ksyslog interface

Perex at 07:38, 11 January 2010

2010-01-11T07:38:15Z

← Older revision		Revision as of 07:38, 11 January 2010
Line 1:		Line 1:
	~~=XRUN Debug=~~

	This page describes the build-in ALSA driver tool to debug PCM ring buffer positions.		This page describes the build-in ALSA driver tool to debug PCM ring buffer positions.

Line 15:		Line 13:
	64 Show the last 10 ring buffer position only once (when first error situation occured)		64 Show the last 10 ring buffer position only once (when first error situation occured)

	To enable more features just do sum values above.		To enable more features just do sum values of above (for example 1+2=3).

	Some good value combinations:		Some good value combinations:

Perex: New page: =XRUN Debug= This page describes the build-in ALSA driver tool to debug PCM ring buffer positions. ===/proc/asound/card#/pcm0p/xrun_debug=== Replace '#' with your card number (usually 0...

2010-01-11T07:37:18Z

New page: =XRUN Debug= This page describes the build-in ALSA driver tool to debug PCM ring buffer positions. ===/proc/asound/card#/pcm0p/xrun_debug=== Replace '#' with your card number (usually 0...

New page

=XRUN Debug=

This page describes the build-in ALSA driver tool to debug PCM ring buffer positions.

===/proc/asound/card#/pcm0p/xrun_debug===

Replace '#' with your card number (usually 0). This proc file can enable various debugging tools. The CONFIG_SND_PCM_XRUN_DEBUG option must be enabled in your kernel (if xrun_debug proc file is present - this feature is enabled).

1 Basic debugging - show xruns in ksyslog interface
2 Dump stack - dump stack for basic debugging
4 Jiffies check - compare the position with kernel jiffies (a sort of in-kernel monotonic clock), show what's changed when basic debugging is enabled
8 Dump positions on each period update call
16 Dump positions on each hardware pointer update call
32 Enable logging of last 10 ring buffer positions
64 Show the last 10 ring buffer position only once (when first error situation occured)

To enable more features just do sum values above.

Some good value combinations:

# Enable basic debugging and dump stack
# Usefull to just see, if PCM stream is stopped for a reason (usually wrong audio process timing from scheduler)
echo 3 > /proc/asound/card0/pcm0p/xrun_debug

# Enable basic debugging, do jiffies check and enable one shot dump of last 10 ring buffer positions
# Usefull, when the position is broken only after some of time (to reduce ksyslog messages)
echo 101 > /proc/asound/card0/pcm0p/xrun_debug

# Enable basic debugging, do jiffies check and dump position on each period and hardware pointer update calls
# Usefull when the lowlevel (specific) hardware driver is somehow broken
echo 29 > /proc/asound/card0/pcm0p/xrun_debug