Re: [Jack-Devel] Questions on tuning netjack performance

Thanks Stéphane! That did the trick :-)


On Sun, Jul 7, 2013 at 12:52 AM, Stéphane Letz <[hidden]> wrote:

>
> Le 7 juil. 2013 à 08:00, Dan Swain <[hidden]> a écrit :
>
> > Dear all,
> >
> > I've been searching for ways to improve the 'latency' of netjack. Thanks
> to quite a few threads and online documents, I finally managed to get -l 1
> working with the netjack driver (I didn't realise the order of switches
> were as significant as they are).
> >
> > The lowest latency I've managed to find is with this -l 1 switch, and
> also without -S, although since my discovery I've not tried sync. Would
> this make a difference?
>
> -S (synchronous) on the slave allows the salve to better handle network
> timing jitter, so I would recommend -S on slave side.
>
> >
> > I did try -l 0, but it made my slave machine eventually fall behind in
> an expected way (I tried to break it, and it did :-) ).
> >
> > I've not been able to find success in the -p switch, so I began to
> wonder if this was driver specific (i.e. portaudio), or if again the
> ordering of the switches is important. If so, where should it be placed?
>
>
> jackd -d net -h gives:
>
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
>         -a, --multicast-ip      Multicast address, or explicit IP of the
> master (default: 225.3.19.154)
>         -p, --udp-net-port      UDP port (default: 19000)
>         -M, --mtu       MTU to the master (default: 1500)
>         -C, --input-ports       Number of audio input ports. If -1, audio
> physical input from the master (default: -1)
>         -P, --output-ports      Number of audio output ports. If -1, audio
> physical output from the master (default: -1)
>         -i, --midi-in-ports     Number of MIDI input ports. If -1, MIDI
> physical input from the master (default: -1)
>         -o, --midi-out-ports    Number of MIDI output ports. If -1, MIDI
> physical output from the master (default: -1)
>         -c, --celt      Set CELT encoding and number of kBits per channel
> (default: -1)
>         -n, --client-name       Name of the jack client (default:
> 'hostname')
>         -s, --auto-save         Save/restore connection state when
> restarting (default: false)
>         -l, --latency   Network latency (default: 5)
>
> ==> -p is for "UDP port"
>
> >
> > So far, my command line looks like this (the slave is on a Windows
> machine):
> >
> > jackd -R -d net -l 1 -i 1 -C 0 -P 8 -n VST
> >
> > I hope that provides enough information to work from, but please let me
> know if you have further questions!
> >
> > Thanks in advance!
> >
> > Dan
>
> I would suggest to add -S.
>
> Stéphane
>
>

1373252065.9253_0.ltw:2, <CABhkv4NUesxCcPPoFUrmNrUSJg916CvviCiGfU9W3MRfjS06oA at mail dot gmail dot com>