Hi,

i hope this is the right place regarding my question..

I have problems with a Netjack connection between two Machines whenever, as it seems, a certain amount
of channels are being added and i cannot figure out the cause.

Machine 1 runs Ubuntu Eean and Ardour 5 on a I3-3210 with 4 GB RAM and a huge swap (just to avoid running out of memory)
Machine 2 runs W7 on a i5-4570, 8GB of RAM with Jack Netdriver (1.9.11) and a rather old Version of FL Studio, using Jack Netrouter as audio Device, unsing onboard Audio

Jack Netdriver on the Windows side is so configured that it offers 2 capture channels and 32 Playback channels in Async mode.
Jack on the Server side (Ubuntu) runs in RT (also tried non-RT) 2048/2, 44.1 KHz

Link between both is 1 GBit/sec. Afaik bow cards are idenitified as RTL8169.

First problem:
- transferring more than two audio channels simultaneously usually leds into "stutter" on Ardour.

Second Problem:
-transferring Audio over more than 10 Channels kills JackD immediate on the server side. Log is on the end of this mail.

Done an iperf(3) between both machines shows no sign of Packet loss (TCP and UDP), Transfer speed is about 903 GBit/sec. Ping is between 0.2 and 0.3 msec

Tried with different MTU´s on both sides between 1500 and 9000, before i replaced my old Slave machine with the I3 it sometimes helped to switch between 1500-900-1500 while Playback of the Slave machine to get rid of the stutter.

I also recompiled JackD on the master machine from 1.9.12 to 1.9.14 with additional DBUS-support, but it doesn´t make any difference.

Firewalls are off while testing. also killed Pulseaudio.

Tried to turn off anything which has to do with Speedstepping, set with cpufreqd everything to "performance", no success at all. Even fillding around with sync, async, different Buffer sizes, periods- no chance.
Yes, according to the log i recognize the missing data packets, but have no clue what could be the cause - Jack itsef, the Jack Netdriver on the Windows side....

Before Ardour connects to Jackd, i also get a lot of "ProcessGrapMasterASync"-Errors....and sometimes in between.

Any help would be greatly appreciated, because i run out of ideas....

Best regards
Stef

Logs:

....<lots of missing Data packets>...

Wed Feb 19 10:48:31 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:31 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
10:48:32.602 XRUN callback (16 Ã¼bersprungen).
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:32 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
10:48:33.176 Schaubild der JACK-Verbindungen geÃ¤ndert.
10:48:34.104 Schaubild der JACK-Verbindungen geÃ¤ndert.
Wed Feb 19 10:48:33 2020: Disconnecting 'bla2-PC-01:from_slave_7' from 'ardour:OBXDLR/audio_in 1'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:33 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:34 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:34 2020: Disconnecting 'bla2-PC-01:from_slave_8' from 'ardour:OBXDLR/audio_in 2'
10:48:34.615 XRUN callback (13 Ã¼bersprungen).
10:48:34.940 Schaubild der JACK-Verbindungen geÃ¤ndert.
Wed Feb 19 10:48:34 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:34 2020: Connecting 'bla2-PC-01:from_slave_4' to 'ardour:OBXDLR/audio_in 1'
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
10:48:35.660 Schaubild der JACK-Verbindungen geÃ¤ndert.
10:48:35.789 Benachrichtigung zum Herunterfahren.
10:48:35.808 Client deaktiviert.
10:48:35.811 D-BUS: JACK-Server wurde angehalten (org.jackaudio.service aka jackdbus).
Cannot read socket fd = 25 err = Erfolg
CheckRes error
JackSocketClientChannel read fail
Server is not running
Server is not running
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:35 2020: Connecting 'bla2-PC-01:from_slave_5' to 'ardour:OBXDLR/audio_in 2'
Wed Feb 19 10:48:35 2020: NetMaster : missing last data packet from 'bla2-PC'
Wed Feb 19 10:48:35 2020: ERROR: Segmentation Fault!
Wed Feb 19 10:48:35 2020: ERROR: info.si_signo = 11
Wed Feb 19 10:48:35 2020: ERROR: info.si_errno = 0
Wed Feb 19 10:48:35 2020: ERROR: info.si_code = 1 (SEGV_MAPERR)
Wed Feb 19 10:48:35 2020: ERROR: info.si_addr = 0x7f458dace558
Wed Feb 19 10:48:35 2020: ERROR: reg[00]       = 0x0000000040800000
Wed Feb 19 10:48:35 2020: ERROR: reg[01]       = 0x0000000000000000
Wed Feb 19 10:48:35 2020: ERROR: reg[02]       = 0x0000000000000000
Wed Feb 19 10:48:35 2020: ERROR: reg[03]       = 0x0000000000000246
Wed Feb 19 10:48:35 2020: ERROR: reg[04]       = 0x00007f47eb77d704
Wed Feb 19 10:48:35 2020: ERROR: reg[05]       = 0x00007f47eb03f66f
Wed Feb 19 10:48:35 2020: ERROR: reg[06]       = 0x00007f47eb03f720
Wed Feb 19 10:48:35 2020: ERROR: reg[07]       = 0x00007f47eaf3df40
Wed Feb 19 10:48:35 2020: ERROR: reg[08]       = 0x00007f47d4010b10
Wed Feb 19 10:48:35 2020: ERROR: reg[09]       = 0x00007f47d400d48c
Wed Feb 19 10:48:35 2020: ERROR: reg[10]       = 0x00007f47eaf3dc60
Wed Feb 19 10:48:35 2020: ERROR: reg[11]       = 0x00007f47d400c6c0
Wed Feb 19 10:48:35 2020: ERROR: reg[12]       = 0xfffffffdb9abd9e8
Wed Feb 19 10:48:35 2020: ERROR: reg[13]       = 0x00007f458dace558
Wed Feb 19 10:48:35 2020: ERROR: reg[14]       = 0x0000000000000000
Wed Feb 19 10:48:35 2020: ERROR: reg[15]       = 0x00007f47eaf3dc40
Wed Feb 19 10:48:35 2020: ERROR: reg[16]       = 0x00007f47ec18ceab
Wed Feb 19 10:48:35 2020: ERROR: reg[17]       = 0x0000000000010203
Wed Feb 19 10:48:35 2020: ERROR: reg[18]       = 0x002b000000000033
Wed Feb 19 10:48:35 2020: ERROR: reg[19]       = 0x0000000000000004
Wed Feb 19 10:48:35 2020: ERROR: reg[20]       = 0x000000000000000e
Wed Feb 19 10:48:35 2020: ERROR: reg[21]       = 0x0000000000005a07
Wed Feb 19 10:48:35 2020: ERROR: reg[22]       = 0x00007f458dace558
Wed Feb 19 10:48:35 2020: ERROR: Stack trace:
Wed Feb 19 10:48:35 2020: ERROR: 1: 0x7f47ec18ceab <Jack::NetFloatAudioBuffer::RenderFromNetwork(char*, int, int)+47> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 2: 0x7f47ec18cdad <Jack::NetFloatAudioBuffer::RenderFromNetwork(int, int, unsigned int)+153> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 3: 0x7f47ec18fe3f <Jack::JackNetInterface::AudioRecv(Jack::_packet_header*, Jack::NetAudioBuffer*)+205> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 4: 0x7f47ec190e37 <Jack::JackNetMasterInterface::DataRecv()+275> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 5: 0x7f47eb77dbd5 <(null)+3950500821> (/usr/local/lib/jack/netmanager.so)
Wed Feb 19 10:48:35 2020: ERROR: 6: 0x7f47eb77d724 <(null)+3950499620> (/usr/local/lib/jack/netmanager.so)
Wed Feb 19 10:48:35 2020: ERROR: 7: 0x7f47ec14778f <Jack::JackClient::CallProcessCallback()+85> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 8: 0x7f47ec14768a <Jack::JackClient::ExecuteThread()+40> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 9: 0x7f47ec144c87 <Jack::JackClient::Execute()+85> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: 10: 0x7f47ec1670e8 <Jack::JackPosixThread::ThreadHandler(void*)+252> (/usr/local/lib/libjackserver.so.0)
Wed Feb 19 10:48:35 2020: ERROR: End of stack trace