From: Clemens Ladisch <clemens@ladisch.de>
To: pl bossart <bossart.nospam@gmail.com>
Cc: General PulseAudio Discussion
<pulseaudio-discuss@mail.0pointer.de>,
alsa-devel@alsa-project.org
Subject: Re: [RFC] disabling ALSA period interrupts
Date: Fri, 30 Apr 2010 13:24:13 +0200 [thread overview]
Message-ID: <4BDABDDD.4050502@ladisch.de> (raw)
In-Reply-To: <h2l6160a5131004291538w6c7891fbn2db3425846aefd60@mail.gmail.com>
pl bossart wrote:
> When PulseAudio is used and all PCM is routed through PulseAudio
> (Fedora, Meego, etc), the notion of ALSA periods isn't very useful.
> So why not disable them entirely to reduce the number of wakeups? ...
> There are probably some cases where you don't want this type of
> behavior (broken hardware, legacy code with multiple-buffering,
> disabled timer in PulseAudio),
It's interesting that all ALSA applications except PA are "legacy". :)
> so I think it would make sense to request the disabling of interrupts
> when hw_params are set, since this is also the time when period sizes
> are set.
Yes. For compatibility with the existing ALSA API, this needs to be
a flag that is not enabled by default.
> I am aware that some changes would be needed in pcm_lib.c, where all
> the error checks are done.
Plus all the API changes in the ALSA kernel framework, the ALSA kernel/
userspace interface, and the alsa-lib interface.
I'll see if I can get this done over the weekend ...
Regards,
Clemens
next prev parent reply other threads:[~2010-04-30 11:24 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-29 22:38 [RFC] disabling ALSA period interrupts pl bossart
2010-04-29 23:18 ` Raymond Yau
[not found] ` <k2j6160a5131004291644rd8645dc7oecee28ee290b683f@mail.gmail.com>
2010-04-30 0:59 ` Raymond Yau
2010-04-30 1:09 ` Raymond Yau
2010-04-30 13:46 ` pl bossart
2010-04-30 22:51 ` Raymond Yau
2010-04-30 3:47 ` Raymond Yau
2010-04-30 11:24 ` Clemens Ladisch [this message]
2010-04-30 13:44 ` pl bossart
2010-05-06 1:24 ` Raymond Yau
2010-05-14 8:12 ` Takashi Iwai
2010-05-14 13:36 ` pl bossart
2010-05-14 21:03 ` pl bossart
2010-05-17 9:12 ` Clemens Ladisch
2010-05-17 9:14 ` [PATCH 1/3] add API to allow disabling " Clemens Ladisch
2010-05-17 9:23 ` Jassi Brar
2010-05-17 11:16 ` Clemens Ladisch
2010-05-17 11:27 ` Jassi Brar
2010-05-17 14:42 ` Jaroslav Kysela
2010-05-17 16:05 ` pl bossart
2010-05-17 16:22 ` Jaroslav Kysela
2010-05-17 16:37 ` pl bossart
2010-05-17 16:54 ` Jaroslav Kysela
2010-05-18 9:11 ` Jassi Brar
2010-05-17 13:59 ` pl bossart
2010-05-17 9:14 ` [PATCH 2/3] ALSA: hda-intel: add support for disabling period irq Clemens Ladisch
2010-05-17 14:05 ` pl bossart
2010-05-17 9:15 ` [PATCH 3/3] ALSA: oxygen: " Clemens Ladisch
2010-05-17 14:17 ` [RFC] disabling ALSA period interrupts pl bossart
2010-05-20 14:50 ` Clemens Ladisch
2010-04-30 16:44 ` Liam Girdwood
2010-04-30 17:39 ` pl bossart
2010-05-04 3:18 ` Raymond Yau
2010-05-07 23:25 ` [alsa-devel] " Lennart Poettering
2010-05-08 3:12 ` pl bossart
2010-05-12 4:00 ` pl bossart
2010-05-12 13:00 ` Jaroslav Kysela
2010-05-12 17:10 ` [alsa-devel] " pl bossart
2010-05-12 18:15 ` Jaroslav Kysela
2010-05-13 3:56 ` pl bossart
2010-05-12 7:22 ` James Courtier-Dutton
2010-05-12 12:42 ` pl bossart
2010-05-13 0:37 ` Raymond Yau
2010-05-14 0:43 ` Raymond Yau
2010-05-14 1:51 ` pl bossart
2010-05-14 2:45 ` Raymond Yau
2010-05-14 3:09 ` Raymond Yau
2010-05-14 4:03 ` Raymond Yau
2010-05-12 13:08 ` Jassi Brar
2010-05-12 13:50 ` [alsa-devel] " pl bossart
2010-05-12 14:15 ` Jassi Brar
2010-05-12 14:16 ` Mark Brown
2010-05-13 0:04 ` Raymond Yau
2010-05-14 4:07 ` Jassi Brar
2010-05-14 4:39 ` pl bossart
2010-05-14 5:27 ` Jassi Brar
2010-05-12 14:41 ` Raymond Yau
2010-05-13 7:27 ` Raymond Yau
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