From: "Clemens Ladisch" <cladisch@fastmail.net>
To: Karsten Wiese <fzu@wemgehoertderstaat.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: [PATCH] US-122L Driver, v0
Date: Thu, 08 Nov 2007 17:14:51 +0100 [thread overview]
Message-ID: <1194538491.3947.1220263479@webmail.messagingengine.com> (raw)
In-Reply-To: <200711081337.05417.fzu@wemgehoertderstaat.de>
Karsten Wiese wrote:
> snd-usb-audio uses number_of_packets equalling multiples of 8 currently
> when transfering over USB 2.0, no?
> If so, with above patch that "multiples of 8"-thing could go away and
> snd-usb-audio could achieve up to 8 times less userspace-activation-jitter
> in low latency setups like 128 frames/period, 2 periods.
I'm using the 8-microframes alignment because ehci-hcd configures the
controller to interrupt at most every 1 ms. It has a module option to
change this, but as long as snd-usb-audio cannot detect a lower setting,
it would not make sense to allow shorter periods.
Regards,
Clemens
next prev parent reply other threads:[~2007-11-08 16:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 15:41 Fwd: [PATCH] ehci-hcd: complete iso urbs ASAP for number_of_packets != (n * 8) also Karsten Wiese
2007-11-07 18:55 ` [PATCH] US-122L Driver, v0 Karsten Wiese
2007-11-07 19:36 ` Karsten Wiese
2007-11-08 7:24 ` Clemens Ladisch
2007-11-08 12:37 ` Karsten Wiese
2007-11-08 16:14 ` Clemens Ladisch [this message]
2007-11-08 16:42 ` Karsten Wiese
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