[linux-audio-dev] ALSA OSS emulation in 2.6 kernel

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Subject: [linux-audio-dev] ALSA OSS emulation in 2.6 kernel
From: Benjamin Flaming (lad_AT_solobanjo.com)
Date: Tue Nov 11 2003 - 14:53:59 EET

I'm not entirely sure whether this is the right place to be posting this or
not. I've been having some strange issues with the OSS emulation in the 2.6
kernel. With each new kernel release, programs which use OSS have taken
progressively longer to start up. Audacity now take about 20 seconds. There
is also a 5-10 second delay from the time I hit "play" in Audacity to the
time when the playback actually starts. Hydrogen takes a similarly long time
to start up if I use OSS output. Finally, if I try to use the OSS MIDI
driver for ZynAddSubFX, the entire system locks up - no Ctrl-Alt-Backspace,
no Ctrl-Alt-Del, no Magic SysRq.

I'm running the 2.6.0-test9 kernel on top of a Slackware 9.0 installation with
an M-Audio Audiophile 2496 card. I have everything built into the kernel.
The machine is an Athlon XP 1800+ with 256m memory.

The output of dmesg after running an OSS application consists of repeated
entries which all begin as follows:

Debug: sleeping function called from invalid context at
include/asm/semaphore.h: 119
in_atomic():1, irqs_disabled():0
Call Trace:
 [<c011ad4b>] __might_sleep+0xab/0xe0
 [<c03727eb>] ap_cs8427_sendbytes+0x3b/0xd0
 [<c0367952>] snd_i2c_sendbytes+0x22/0x30
 [<c03667b6>] snd_cs8427_reg_write+0x36/0x80
 [<c0366e26>] snd_cs8427_reset+0x56/0x240
 [<c036763a>] snd_cs8427_iec958_pcm+0xea/0x170
 [<c0370b23>] snd_ice1712_playback_pro_hw_params+0x73/0x80
 [<c0343507>] snd_pcm_hw_params+0x267/0x2a0
 [<c03435d8>] snd_pcm_hw_params_user+0x98/0x100
(followed by various functions, most of which begin with "snd_")

I've posted the complete output of dmesg at:

http://www.comevisit.com/NorthernSunrise/oss26/dmesg

My kernel .config is at:

http://www.comevisit.com/NorthernSunrise/oss26/config

If there's anything I can do to help track this down, or if there is a better
list for me to post this on, please let me know.

|)
|)enji

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