From: Takashi Iwai <tiwai@suse.de>
To: Jaroslav Kysela <perex@suse.cz>
Cc: Johan Bilien <jobi@via.ecp.fr>, alsa-devel@lists.sourceforge.net
Subject: Re: start_threshold having no effect
Date: Tue, 21 Oct 2003 14:26:24 +0200 [thread overview]
Message-ID: <s5hoewadbf3.wl@alsa2.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.53.0310211326180.25721@pnote.perex-int.cz>
At Tue, 21 Oct 2003 13:32:10 +0200 (CEST),
Jaroslav wrote:
>
> > very short while a write will block for more than one second. Are those
> > ALSA related problems, or hardware ones ?
>
> You said that you're using an USB device. It might be a problem with our
> USB driver. Also, USB devices are working with 1ms periods at the physical
> level, so transferring 32 frames does not make probably sense anyway.
this should be ok, since the sample rate is 8k Hz (although
RT-scheduling would be needed for 4ms periods.)
but 1ms period alignment is important: if you want a RT process with
the USB audio device, choose the sample rate with multiple of 1000.
for example, avoid 44.1kHz, but use 48k instead.
Takashi
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next prev parent reply other threads:[~2003-10-21 12:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-20 17:30 start_threshold having no effect Johan Bilien
2003-10-20 22:23 ` Paul Davis
2003-10-21 9:50 ` Johan Bilien
2003-10-21 11:32 ` Jaroslav Kysela
2003-10-21 12:26 ` Takashi Iwai [this message]
2003-10-21 12:28 ` Johan Bilien
2003-10-21 12:39 ` Paul Davis
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