Asrock Q1900B-ITX

ississ wrote:

Today I decided to test if he uspace version is suitable for paraller port usage too because of the good looking latency.
Installed using linuxcnc-stretch-uspace-amd64-r13.iso image.
Latency is quite good, ~4000 servo, ~13000 base (2x 8G samsung M471B1G73QH0-YK0 memory modules) with kernel command line "isolcpus=2,3 acpi_irq_nobalance noirqbalance"
Using irq affinity (all to cpu0) discussed elsewhere in forum the latency is a bit better but not significantly (only a few hundred after overnight test).

Latency stays at max ~5000 servo, ~15000 base when running overnight with 6 glxgears and youtube. Additional load with samba & file transfer does not make a difference.

But when starting linuxcnc I always get "Unexpected real time delay on task 0".

uname -a:
Linux sorvi 4.9.0-8-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.110-3+deb9u6 (2018-10-08) x86_64 GNU/Linux

cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.9.0-8-rt-amd64 root=UUID=a07de53a-6564-44d7-b7c6-86c7ea742140 ro quiet isolcpus=2,3 acpi_irq_nobalance noirqbalance

Linuxcnc output on terminal:
Unexpected realtime delay on task 0
This Message will only display once per session.
Run the Latency Test and resolve before continuing.
Unexpected realtime delay on task 0
This Message will only display once per session.
Run the Latency Test and resolve before continuing.
Shutting down and cleaning up LinuxCNC...
task: 2050 cycles, min=0.000022, max=0.011068, avg=0.009994, 0 latency excursions (> 10x expected cycle time of 0.010000s)
Note: Using POSIX realtime

Linuxcnc 2.7.14 seems not to print anything to view with dmesg. No _print.txt or _debug.txt on home directory.

Any ideas why unexpected delay happens on startup with those latency numbers ?
Or something else that can cause unexpected delay ?

Maybe I should still stay with the old rtai version if this cannot be solved... odd because of the latency should not be an issue by looking at the numbers.

tarasko wrote:

ississ wrote:

Today I decided to test if he uspace version is suitable for paraller port usage too because of the good looking latency.
Installed using linuxcnc-stretch-uspace-amd64-r13.iso image.
...

With these params "isolcpus=2,3 acpi_irq_nobalance noirqbalance" my setup became pretty stable. I put 27000 for BASE_PERIOD and after that no unexpected delay errors during startup of linuxcnc.
 

ississ wrote:

tarasko wrote:

ississ wrote:

Today I decided to test if he uspace version is suitable for paraller port usage too because of the good looking latency.
Installed using linuxcnc-stretch-uspace-amd64-r13.iso image.
...

With these params "isolcpus=2,3 acpi_irq_nobalance noirqbalance" my setup became pretty stable. I put 27000 for BASE_PERIOD and after that no unexpected delay errors during startup of linuxcnc.
 

Did you use the same (or newer) uspace version ?

All of my 3 boards worked really well with the old rtai version but not with the uspace.
The unexpected delay happened only with uspace version, there were no base period then.

If the uspace version is working on your board, can you share your bios settings and which memory modules you are using ?





 

macsddau@linuxcnc wrote:

On an ASRock J3355B-ITX (celeron 2 cores) , I just add a MESA 6i25 to the config to solve latency problems and to remove stepping generation form the motherboard cpu. I have keep the same pinout as the parport.
the 6i25 was available form eusurplus fiew weeks ago. A little expensive with vat and shiping. 

tarasko wrote:

macsddau@linuxcnc wrote:

On an ASRock J3355B-ITX (celeron 2 cores) , I just add a MESA 6i25 to the config to solve latency problems and to remove stepping generation form the motherboard cpu. I have keep the same pinout as the parport.
the 6i25 was available form eusurplus fiew weeks ago. A little expensive with vat and shiping. 
Could you please advise where to get any info how to setup this mesa 6i25 (except basic linuxcnc documentation)
 

• 5i25_prob_rfx2.bit => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.xml => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.pin => /usr/share/doc/hostmot2-rimware-5i25/

macsddau@linuxcnc wrote:

tarasko wrote:

macsddau@linuxcnc wrote:

On an ASRock J3355B-ITX (celeron 2 cores) , I just add a MESA 6i25 to the config to solve latency problems and to remove stepping generation form the motherboard cpu. I have keep the same pinout as the parport.
the 6i25 was available form eusurplus fiew weeks ago. A little expensive with vat and shiping. 
Could you please advise where to get any info how to setup this mesa 6i25 (except basic linuxcnc documentation)
 

I use 5i25_prob_rfx2 conf.
Flashed 5i25_prob_rfx1.bit into the 6i25 card.
copy 5i25_prob_rfx2 files to some places (don't know if it is necessay but that's work) :

• 5i25_prob_rfx2.bit => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.xml => /lib/firmware/hm2/5i25/
• 5i25_prob_rfx2.pin => /usr/share/doc/hostmot2-rimware-5i25/
  
  used pncconf
   
  
  
   
  
  AlA