From: bugtrack@alsa-project.org
To: alsa-devel@alsa-project.org
Subject: [ALSA - driver 0001869]: Playing surround sound produces 100% CPU load
Date: Tue, 25 Jul 2006 03:00:32 +0200 [thread overview]
Message-ID: <5329e554bc201a477c7940ef993581ec@bugtrack.alsa-project.org> (raw)
A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1869>
======================================================================
Reported By: bitmage2
Assigned To:
======================================================================
Project: ALSA - driver
Issue ID: 1869
Category: CORE - pcm
Reproducibility: always
Severity: minor
Priority: normal
Status: new
Distribution: SuSE Linux 10.0
Kernel Version: Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC
2006 i686 athlon i386 GNU/Linux
======================================================================
Date Submitted: 02-23-2006 00:48 CET
Last Modified: 07-25-2006 03:00 CEST
======================================================================
Summary: Playing surround sound produces 100% CPU load
Description:
I am using the CS46xx with a Hercules Gametheater XP 5.1 . It plays back
stereo without problems.
I wanted to use the rest of my 5.1 speaker set, so for a test I ran the
speaker-test program. Running it without parameters or with 2 or 4.0
channels works also fine. So far so good.
But when I run it with 5.0 channels or 5.1 channels the CPU load of
speaker-test goes to 100%. I'll show the output of top along with the
command lines below (for the 2.0 and 5.1 case) in the "Additional
Information" box.
======================================================================
----------------------------------------------------------------------
bitmage2 - 07-24-06 20:38
----------------------------------------------------------------------
I just validated, that the problem is still there in 1.0.12rc1 . I did
install that version on a clean linux installation.
I also did a "strace speaker-test ...". While everything works fine, it
looks like this:
...
poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) =
1
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) =
1
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) =
1
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) =
1
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
...
When the problem shows up, the strace output is this (not calling poll()
anymore):
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
ioctl(4, 0x4122, 0xbfeb2ab8) = 0
...
----------------------------------------------------------------------
Raymond - 07-25-06 03:00
----------------------------------------------------------------------
It is possible that you have many sound servers(e.g. esd, arts, ... )
running without notice since cs46xx support hardware mixing ( multiple
subdevices )
00-00: CS46xx : CS46xx : playback 31 : capture 1
00-01: CS46xx - Rear : CS46xx - Rear : playback 31
00-02: CS46xx - IEC958 : CS46xx - IEC958 : playback 1
00-03: CS46xx - Center LFE : CS46xx - Center LFE : playback 31
The problem will be the lock in rear device if you have any sound
server(OSS emulation) which use more than 2 channels
Issue History
Date Modified Username Field Change
======================================================================
02-23-06 00:48 bitmage2 New Issue
02-23-06 00:48 bitmage2 Distribution => SuSE Linux 10.0
02-23-06 00:48 bitmage2 Kernel Version => Linux
2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux
02-23-06 00:54 bitmage2 Note Added: 0008164
02-23-06 00:55 bitmage2 Issue Monitored: bitmage2
07-11-06 05:58 Raymond Note Added: 0010964
07-14-06 20:57 bitmage2 Note Added: 0011004
07-14-06 20:59 bitmage2 Note Added: 0011005
07-14-06 21:25 rlrevell Note Added: 0011006
07-14-06 22:40 bitmage2 Note Added: 0011008
07-14-06 22:57 rlrevell Note Added: 0011009
07-15-06 01:28 bitmage2 Note Added: 0011013
07-15-06 01:45 rlrevell Note Added: 0011014
07-15-06 05:09 Raymond Note Added: 0011017
07-15-06 07:17 Raymond Note Edited: 0011017
07-23-06 11:34 bitmage2 Note Added: 0011183
07-23-06 13:49 Raymond Note Added: 0011185
07-23-06 14:14 Raymond Note Added: 0011186
07-23-06 14:16 Raymond Note Deleted: 0011186
07-23-06 15:04 bitmage2 Note Added: 0011189
07-24-06 04:19 Raymond Note Added: 0011209
07-24-06 05:04 Raymond Note Edited: 0011209
07-24-06 20:38 bitmage2 Note Added: 0011214
07-25-06 03:00 Raymond Note Added: 0011223
======================================================================
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next reply other threads:[~2006-07-25 1:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-25 1:00 bugtrack [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-08-01 8:46 [ALSA - driver 0001869]: Playing surround sound produces 100% CPU load bugtrack
2006-08-01 7:36 bugtrack
2006-08-01 6:15 bugtrack
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