[LAU] reducing xruns (System configuration)

[Will Godfrey]

On Thu, 19 Jul 2018 14:32:49 +0200
Max <abonnements at revolwear.com> wrote:

>On 18.07.2018 23:20, Will Godfrey wrote:
>> Something nobody seems to have mentioned is the command lsusb.
>> This will show you what is hanging on which bus. Ideally you want to try
>> different sockets until you find one that has nothing else on it.  
>
> > [..]  
>
>> I don't know the sound card you are using, or how old it is, or even how well
>> it's firmware supports USB2, but USB2 speeds on modern cards can easily manage
>> 64/2 at 48k. Indeed, mine can (just) manage 16/2 at 48k.  
>
>Thanks Will, that makes sense.
>
>Bus 002 Device 002: ID 8087:8000 Intel Corp.
>Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>Bus 001 Device 002: ID 8087:8008 Intel Corp.
>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>Bus 003 Device 004: ID 8087:07dc Intel Corp.
>Bus 003 Device 021: ID 04b4:beef Cypress Semiconductor Corp.
>Bus 003 Device 007: ID 046a:b090 Cherry GmbH
>Bus 003 Device 008: ID 0424:4060 Standard Microsystems Corp. Ultra Fast 
>Media Reader
>Bus 003 Device 005: ID 0424:2640 Standard Microsystems Corp. USB 2.0 Hub
>Bus 003 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
>Bus 003 Device 006: ID 0bda:5719 Realtek Semiconductor Corp.
>Bus 003 Device 002: ID 08bb:29c2 Texas Instruments PCM2902C Audio CODEC
>Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
>I assume that the bus can only be changed by physically attaching the 
>devices to different ports. Is that right? The audio interface (Texas 
>Instruments, A Behringer mixer) already is plugged in its own USB port, 
>I might see if a different port changes something.

You want it on a different *bus*. It's on bus 003 and shared with quite a lot
of other stuff, including two additional hubs. The available bandwidth is shared
between all of these ports.

Try and get it on bus 004 if you can. That one is clean with just a linux root
hub.

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.