From: Clemens Ladisch <clemens@ladisch.de>
To: "Dominic Sacré" <dominic.sacre@gmx.de>, alsa-devel@alsa-project.org
Subject: Re: snd-fireworks requires larger period sizes than FFADO
Date: Mon, 23 Nov 2015 11:40:56 +0100 [thread overview]
Message-ID: <5652ED38.6080409@ladisch.de> (raw)
In-Reply-To: <56510A5F.4080004@gmx.de>
Dominic Sacré wrote:
> I'm trying to use an Echo AudioFire 4 with the snd-fireworks driver.
> With FFADO the device works reasonably well at a period size of
> 64 samples (on a PREEMPT_RT kernel), whereas with snd-fireworks the
> lowest possible period size seems to be 256 samples.
>
> The lowest achievable analog roundtrip latency seems to be around 19ms
> (at 2x256 frames), as opposed to 8.3ms with FFADO (at 2x64). Are there
> any known limitations of the snd-fireworks driver in this regard?
At the moment, the driver uses a minimum period size of 5 ms.
You could try reducing INTERRUPT_INTERVAL and the parameter to
snd_pcm_hw_constraint_minmax() in sound/firewire/amdtp-stream.c, and
recompiling the driver.
Regards,
Clemens
next prev parent reply other threads:[~2015-11-23 10:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-22 0:20 snd-fireworks requires larger period sizes than FFADO Dominic Sacré
2015-11-23 10:40 ` Clemens Ladisch [this message]
2015-12-01 14:31 ` Stefan Richter
2015-12-01 17:15 ` Clemens Ladisch
2015-12-02 0:31 ` Takashi Sakamoto
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