On 05/12/2017 11:51 PM, Ralf Mardorf wrote:
Hi,
IMO we should get used to USB class compliant devices _even without
access to the hardware mixer_.
In some cases that is all you need[*].
In the case of the Motu 16A/24Ai/24ao/etc the web interface makes them
usable for my purpose. Without that, you would need to initialize the
interface with a different operating system. And you would not be able
to use the internal routing matrix, and/or multiple devices
interconnected through AVB. So it is not optional and not having access
to the internals would make the device useless.
With my new mobo (elCheapo,as well as
the CPU, it's just an Intel(R) Celeron(R) CPU G1840 @ 2.80GHz) I noticed
that even if IRQs are shared with USB and even if it is impossible to
unbind devices, even if IRQs of some components differ with each
reboot, low latency without xruns is provided.
Good for you. I did not notice any big problems either. But I'm using
this in concert performance situations, with the interfaces driving a
24.8 speaker array for 3D sound. I tried to minimize the chance of
random interactions between peripherals.
Also, I found upping the IRQ priority for the USB subsystem to be
essential for good performance. As the USB priority is very high for the
soundcard I would rather not have the mouse and other stuff running at
that priority.
-- Fernando
[*] and sometimes it is tricky. We got some Tascam 4x4 for four channel
use - the default setup folds over the "back" channels to the front so
that (I guess) monitoring works. Not what we needed. The only way to fix
that was to initialize the setting on a Mac.
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