From: Takashi Iwai <tiwai@suse.de>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: Andy Robinson <andy@seventhstring.com>,
ALSA devel <alsa-devel@lists.sourceforge.net>
Subject: Re: Re: Memory allocation and the "prealloc" procfile
Date: Fri, 08 Apr 2005 13:06:43 +0200 [thread overview]
Message-ID: <s5h1x9lr0ho.wl@alsa2.suse.de> (raw)
In-Reply-To: <Pine.HPX.4.33n.0504081252410.22473-100000@studcom.urz.uni-halle.de>
At Fri, 8 Apr 2005 12:55:29 +0200 (METDST),
Clemens Ladisch wrote:
>
> Andy Robinson wrote:
> > But I'm still curious to know, what is all that
> > /proc/asound/card0/pcm0p/sub0/prealloc memory used for?
>
> For the buffer. :)
>
> > I specify 128k but only get a 32k buffer reported by
> > SNDCTL_DSP_GETOSPACE (and one of my users gets only 4k of buffer)
>
> Doesn't happen on my machine. What parameters are you using?
I guess this depends on the order of ioctls.
Each ioctl limits the available configuration. At each time either
fragment size, fragment, format, channels, etc. is changed via ioctl,
the max. buffer size is recalculated, but it won't grow once if the
size is limited via the constraint.
Takashi
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prev parent reply other threads:[~2005-04-08 11:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20050405192033.6B8A88993B@sc8-sf-spam1.sourceforge.net>
2005-04-06 12:03 ` Memory allocation and the "prealloc" procfile Andy Robinson
2005-04-08 10:55 ` Clemens Ladisch
2005-04-08 11:06 ` Takashi Iwai [this message]
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