Re: [Jack-Devel] ardour3, netjack, bandwidth, xruns

Try to change the "mtu" value on slave side, using "jumbo" frames on GB network, like

jackd -d net -M  9000

Stéphane

Le 1 janv. 2014 à 17:42, David Santamauro <[hidden]> a écrit :

> 
> Hi,
> 
> Happy new year ... if this isn't the appropriate list, direct to the
> right one, thanks.
> 
> I've started creating my orchestral template using ardour3 (on the
> master) and a slave. When I reach a certain number of tracks the xruns
> start piling up.
> 
> Master message(s):
> Wed Jan  1 07:15:08 2014: NetMaster : overloaded, skipping receive from
> 'nslave01'
> 
> ... does this mean the master is overloaded?
> 
> The specs:
>  - master is an 8-core/16GB RAM
>  - slave is 4-core/16GB RAM
> 
> Goal is to use windows orchestral VSTi(s) whose required 'dongle' is on a windows machine.
> 
>  ardour3:midi-track-1 => slave:midi-input-1
>  slave:audio-out-1    => ardour3:audio-track-in-1
>  slave:audio-out-2    => ardour3:audio-track-in-2
> 
> Pretty simple, actually, but I'd like 48 channels of audio to come back from the slave.
> 
> Both have Gb network interfaces and both are connected to a Gb switch.
> 
> ardour3 does take CPU slices but the master load avg is ~ 85% idle and
> DSP load < 20%.
> 
> Viewing network traffic using iptraf, I see total usage in the 45Mb/s
> (4% utilization) range for both master and slave -- clearly room to
> spare so I'm assuming there is some other bottleneck somewhere.
> 
> I guess the questions are:
> 
>  - are there hard limits on the number of tracks that can be used when
> using using jack over the network?
> 
>  - Is there a formula to figure out this out, e.g., is there a
> relationship between the size of the jack graph and data per cycle?
> 
>  - Are there settings (network or for jack_load netmanager) that would
> help this situation?
> 
> Both master and slave jackd versions are the same:
> 
> $ jackd -V
> jackdmp 1.9.9.5
> 
> I've read this [1] and it appears there are two modes: sync and async.
> I'll try toggling this and see what happens.
> 
> ... but any other help would be appreciated.
> 
> David
> 
> [1] http://trac.jackaudio.org/wiki/WalkThrough/User/NetJack2
> 
> 
> 
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