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Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed

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6 years 1 month ago #181220 by Adik A.
Replied by Adik A. on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed
Hello BeagleBrainz

RTAI: github.com/NTULINUX/RTAI/archive/master.zip

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6 years 1 month ago #181222 by BeagleBrainz
Replied by BeagleBrainz on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed
What hardware are you going to be using to control your machine ?
I think it may be helpful if you state your goal and the hardware you hope to use with Linuxcnc ie: Mesa or Parallel port. As you have been jumping back & forth between RTAI & RT_PREEMPT.

As far as I know there is only one rtai version that will work with Linuxcnc, as I said before there as been a lot of work into getting Linuxcnc & the rtai kernel to work.

As it stands the current rtai kernel that is known to work with linuxcnc can have limited graphics.

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6 years 1 month ago - 6 years 1 month ago #181224 by Adik A.
Replied by Adik A. on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed
Hardware: Mesa 7i76e card.

I'm waiting for the delivery of DYN4 servo drives from DMM.

For my config (Core i5-9500, M.2 SSD, mini-itx mainboard) RTAI with kernel 4.x offers lower jitter (13us), RT_PREEMPT with kernel 5.6.19 jitter jumps to 80-100us.
Last edit: 6 years 1 month ago by Adik A..

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6 years 1 month ago - 6 years 1 month ago #181225 by BeagleBrainz
Replied by BeagleBrainz on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed
You want RT_PREEMPT for Mesa ethernet. Your latency is fine.

YOU NEED TO USE RT_PREEMPT

DO NOT YOU USE RTAI FOR MESA ETHERNET

On my Lenovo T530 using my Mint 19.2 install.
running
Code:
latency-histogram --nobase
gives the follwoing
Last edit: 6 years 1 month ago by BeagleBrainz.

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6 years 1 month ago #181226 by Adik A.
Replied by Adik A. on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed
ok, so the conclusion: with Mesa Ethernet cards jitter is not as important as with a parallel connection right?

I tried your Linux Mint 19 repository but unfortunately there is a download error. I posted a log in the appropriate topic.

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5 years 10 months ago #191943 by mirkap
Replied by mirkap on topic Xubuntu 18.04.5 + kernel 5.6.19-rt12 | rtai-modules-5.6.19-rt12 missed

Adik A. wrote: Hello again,
...

Error:

Code:
In file included from ./include/linux/compat.h:16:0, from ./arch/x86/include/asm/fpu/internal.h:14, from /root/src/RTAI-master/include/asm/rtai_fpu.h:191, from /root/src/RTAI-master/include/asm/rtai_hal.h:61, from /root/src/RTAI-master/include/asm/rtai.h:23, from /root/src/RTAI-master/include/rtai.h:27, from /root/src/RTAI-master/src/sched/rtai_hal.c:75: ./include/linux/if.h:28:10: fatal error: sys/socket.h: There is no such file or directory #include <sys/socket.h> /* for struct sockaddr. */ ^~~~~~~~~~~~~~

a bit earlier:
Code:
libtool: link: gcc -o calibrate calibrate-calibrate.o -lpthread test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \ echo >&2; \ echo >&2 " ERROR: Kernel configuration is invalid."; \ echo >&2 " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo >&2 ; \ /bin/false)

Has anyone successfully compiled the rtai-modules for v.4.19.14 and knows how to correct this error?
.[/b]


Hi,

I have exactly the same problem.

I try to compile RTAI 5.2.3. on Debian distro kernel 4.19.152.
I want to use RTAI with parallel port.

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