Installing Uspace for Master

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03 Dec 2016 04:01 #83609 by PCW
Replied by PCW on topic Installing Uspace for Master
The first link is not going to help much, If you are running a Mesa Ethernet I/O card,
you do not want RTAI, but rather Preempt-RT

Its not terribly difficult to build a Preempt-RT kernel, for example here is a script to build a 4.1.35-rt41
real time kernel:

cd ~
sudo apt-get update
sudo apt-get install build-essential bin86 kernel-package libqt4-dev libncurses5-dev libssl-dev pkg-config
mkdir rtlinux
cd rtlinux
wget ftp://ftp.kernel.org/pub/linux/kernel/v4.x/linux-4.1.35.tar.xz
wget www.kernel.org/pub/linux/kernel/projects...4.1.35-rt41.patch.gz
tar -xpf linux-4.1.35.tar.xz
gunzip patch-4.1.35-rt41.patch.gz
cp patch-4.1.35-rt41.patch linux-4.1.35
cd linux-4.1.35
cat patch-4.1.35-rt41.patch | patch -p1
make xconfig
make -j8
sudo make modules_install
sudo make install

In the xconfig step you must at the minimum select the proper kernel word size (32 or 64 bits depending on your OS)
and also select "Fully Preemptable Kernel" in the "Processor Types and Features" section

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03 Dec 2016 09:46 #83610 by rodw
Replied by rodw on topic Installing Uspace for Master
Peter, thanks for that awesome script. Unfortunately, it ran fine until the very last command which errored out with
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.1.35-rt41 /boot/vmlinuz-4.1.35-rt41
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.1.35-rt41 /boot/vmlinuz-4.1.35-rt41
/usr/sbin/grub-mkconfig: 35: /etc/default/grub: acp_irq_nobalance: not found
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127
make[1]: *** [install] Error 1
make: *** [install] Error 2

Google can't find one thing about acp_irq_nobalance so I am at a bit of a loss. I suspect its a grub setting of some kind. Any ideas would be really appreciated as I have no idea where to go from here.

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03 Dec 2016 14:47 - 03 Dec 2016 14:48 #83617 by PCW
Replied by PCW on topic Installing Uspace for Master
Not sure why you are getting this, I've not seen this error before
was grub modified (that is is this a clean OS install or has it been fussed with)

As a quick workaround, i would remove acp_irq_nobalance from /etc/default/grub
Last edit: 03 Dec 2016 14:48 by PCW.

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03 Dec 2016 14:57 #83618 by Hakan
Replied by Hakan on topic Installing Uspace for Master
PCW, was there any particular reason you choose version 4.1.35?
I would have chosen a more recent version like 4.8.11.
Assumption is that later = better device support. May not always be true.

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03 Dec 2016 15:02 - 03 Dec 2016 20:13 #83620 by PCW
Replied by PCW on topic Installing Uspace for Master
My experience is that the 4.4 and above kernels tend to have poor latency on older hardware
(Core Duos etc) and that 4.1 is more consistent across a wider range of hardware,
but if you have very new hardware you probably need one of the newer kernels
Last edit: 03 Dec 2016 20:13 by PCW.

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03 Dec 2016 18:49 #83628 by Hakan
Replied by Hakan on topic Installing Uspace for Master
Thanks, good to know.

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03 Dec 2016 20:41 #83630 by rodw
Replied by rodw on topic Installing Uspace for Master

Not sure why you are getting this, I've not seen this error before
was grub modified (that is is this a clean OS install or has it been fussed with)

As a quick workaround, i would remove acp_irq_nobalance from /etc/default/grub


PCW, thanks. It was me. I had played around in grub with isolcpus to see if I could improve latency based on the LCNC wiki here
[url=http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2]http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2[/url]
and had added
# Set isolcpus as per LinuxCNC
isolcpus=3 acp_irq_nobalance noirqbalance

Updating grub is now booting the new kernel, Thanks a lot!
Should we be using isolcpus anymore?

There is more work to do.

The main issue I wanted to fix was the lack of a graphics driver but when I install the MIcrosoft deb package I still get
Error Dependency is not available
libglib2.0-0 (>=2.37.3)
This error has not changed with the kernel upgrade.
I downloaded libglib2 V2.42 but Gdebi complains it breaks existing package libglib2.0-bin which isn't listed in Synaptic.

Any pointers from here?

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03 Dec 2016 21:21 #83631 by PCW
Replied by PCW on topic Installing Uspace for Master
You probably dont want isolcpus

why are you installing graphics driver?

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03 Dec 2016 21:45 #83632 by rodw
Replied by rodw on topic Installing Uspace for Master
Thanks, desktop icons don't display. There is a command I found from the terminal that will make them display but as soon as you close the terminal they disappear again. Apparently, it is fixed if you have a good graphics driver. Mine show as unknown.

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03 Dec 2016 22:07 - 03 Dec 2016 22:08 #83633 by PCW
Replied by PCW on topic Installing Uspace for Master
Very strange

What hardware do you have and what OS are you using?

You really should not have to install _any_ drivers

(and you dont want to either as they will likely break real time since they are not patched)
Last edit: 03 Dec 2016 22:08 by PCW.

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