13 Jul
2021
13 Jul
'21
8:42 p.m.
On 7/13/21 8:20 AM, Brandon Hale wrote:
Thanks so much for these links Fernando. I've
played with the OpenAvnu
repo about 2 years ago, but I couldn't get it working as I didn't know
what I was doing. I'll try compiling it with the standard Linux network
stack and see how far I get.
I don't currently have a motu avb interface, but I do have access to an
RME Digiface AVB <https://www.rme-usa.com/digiface-avb.html>. I'll look
through those repositories, but I figure there's not much I can do with
that interface on Linux as of yet. :(
What interface do you use to get the 64 channels over usb?
There are several, at home I currently have an 8M and a 16A and I am
driving them through a patched kernel with the drumfix's driver (caveat:
the driver does NOT work with an RT patched kernel - something to do
with the number of interrupts generated and context switches - but it
works fine with a full preemption kernel with threadirqs disabled),
details in this thread:
https://linuxmusicians.com/viewtopic.php?f=6&t=18046&sid=5021bc427a…
For a couple of our speaker arrays I have again used 16A and 8M mainly
as gateways into a larger array of Motus[*], but the 24ai and 24ao also
work. For these I am still running old firmware and the regular usb
driver in linux (newer Motu interfaces cannot be downgraded to old
enough firmware for the class compliant driver to work).
-- Fernando
[*] https://ccrma.stanford.edu/~nando/publications/stage_grail_2019.pdf
On 7/13/21 2:17 AM, Fernando Lopez-Lezcano wrote:
> On 7/12/21 3:47 PM, Brandon Hale wrote:
>> Hello all,
>>
>> Are there any of you here who are using AVB on Linux, especially with
>> a standard Ethernet port? What software or hardware are you using to
>> do this on your Linux machines? I am interested in playing with it
>> and have some AVB speakers to mess with, but I'm not sure if it is
>> even possible yet, especially with a standard laptop Ethernet port.
>>
>> Tell me about your Linux AVB success stories!
>
> None yet... :-(
>
> Regarding the use of i210 network interfaces, a while back I found this:
> https://github.com/AVnu/OpenAvnu/issues/601
>
> ----
> At the top-level of the OpenAvnu checkout, run this make command:
>
> $ PLATFORM_TOOLCHAIN=generic make avtp_pipeline
>
> That will prevent it from linking to the i210 library and instead use
> the standard Linux network stack. The packet launch times and
> presentation timestamps will be
> far less even and I'm working on ways to lessen those problems, but
> you should be able to get a talker and listener built from the
> avtp_pipeline code to work toge
> ther with some tweaking of the avtp_pipeline INI files. Be sure to
> read through the documentation that comes with the avtp_pipeline code.
> ----
>
> But never had a chance to test it and see if it really works...
>
> Then there is this software:
> https://github.com/Drumfix/avb4linux.git
>
> This is just 8 ports i/o on linux for motu avb cards, but it needs an
> i210 NIC (by the same guy that posted an experimental driver for
> proprietary usb mode on Motu's - in the LinuxMusicians forum - so you
> can get 64 channel i/o over usb with the newest firmware - I am using
> it and it works quite nicely).
>
> -- Fernando