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Install the Preempt - Rt Kernel

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10 years 3 months ago #77300 by Rolquin
Replied by Rolquin on topic Install the Preempt - Rt Kernel
Hi Todd , I appreciate your help , but the learning curve for me has been a little bit slow.
I have been out for a while , but now I'm back trying to fix the installation.

Would you please tell me how to set root privileges ? I opened the text editor , but can not change the file.
Was considering a new installation , but I have to learn so I become familiar with Devian.

Thanks,

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10 years 3 months ago #77301 by PCW
Replied by PCW on topic Install the Preempt - Rt Kernel
You can do this by launching the editor from a terminal:

sudo mousepad /etc/apt/sources.list

for LinuxCNC/wheezy

or

sudo gedit /etc/apt/sources.list

for gnome based dists

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10 years 3 months ago - 10 years 3 months ago #77628 by vre
Replied by vre on topic Install the Preempt - Rt Kernel
i have upgraded to jessie to try linuxcnc_uspace but i can not find where rt-preemt kernel is .
I have installed linuxcnc_uspace from here
deb www.linuxcnc.org/ jessie base 2.7-uspace
deb-src www.linuxcnc.org/ jessie base 2.7-uspace

but where is the preemt rt kernel ?

ok i found it here
deb ftp.debian.org/debian jessie-backports main
Code:
$ uname -a Linux linuxcnc 4.6.0-0.bpo.1-rt-686-pae #1 SMP PREEMPT RT Debian 4.6.3-1~bpo8+1 (2016-07-13) i686 GNU/Linux

but the jitter sucks with this kernel much worse than rtai
so we need linuxcnc with rtai kernel for jessie
Last edit: 10 years 3 months ago by vre.

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10 years 3 months ago #77653 by PCW
Replied by PCW on topic Install the Preempt - Rt Kernel
How bad is the jitter with Preempt-RT?

It may be a lot less important than you think (unless you are doing software stepping)

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10 years 3 months ago - 10 years 3 months ago #77666 by vre
Replied by vre on topic Install the Preempt - Rt Kernel

Code:
$ uname -a Linux linuxcnc 4.6.0-0.bpo.1-rt-686-pae #1 SMP PREEMPT RT Debian 4.6.3-1~bpo8+1 (2016-07-13) i686 GNU/Linux

but look what iam getting in dmesg
Code:
[ 1190.501640] ------------[ cut here ]------------ [ 1190.501648] WARNING: CPU: 0 PID: 2291 at /home/zumbi/linux-4.6.3/debian/build/source_rt/arch/x86/include/asm/fpu/internal.h:532 fpu__restore+0xbb/0x160 [ 1190.501673] Modules linked in: hidp(E) bnep(E) btusb(E) btrtl(E) btbcm(E) btintel(E) bluetooth(E) ch341(E) usbserial(E) joydev(E) ppdev(E) snd_hda_codec_realtek(E) snd_hda_codec_generic(E) parport_serial(E) binfmt_misc(E) parport_pc(E) parport(E) snd_hda_codec_hdmi(E) sp5100_tco(E) cfg80211(E) hid_generic(E) usbhid(E) hid(E) eeepc_wmi(E) asus_wmi(E) sparse_keymap(E) nfsd(E) rfkill(E) auth_rpcgss(E) nfs_acl(E) video(E) evdev(E) nfs(E) lockd(E) grace(E) fscache(E) sunrpc(E) kvm_amd(E) kvm(E) irqbypass(E) serio_raw(E) pcspkr(E) k10temp(E) shpchp(E) snd_hda_intel(E) snd_hda_codec(E) snd_hda_core(E) snd_hwdep(E) snd_pcm(E) snd_timer(E) i2c_piix4(E) snd(E) soundcore(E) wmi(E) 8250_fintek(E) radeon(E) acpi_cpufreq(E) ttm(E) drm_kms_helper(E) tpm_tis(E) drm(E) tpm(E) button(E) i2c_algo_bit(E) processor(E) [ 1190.501682] loop(E) fuse(E) autofs4(E) ext4(E) crc16(E) jbd2(E) mbcache(E) sg(E) sr_mod(E) cdrom(E) sd_mod(E) ohci_pci(E) ahci(E) xhci_pci(E) ehci_pci(E) ohci_hcd(E) libahci(E) ehci_hcd(E) xhci_hcd(E) psmouse(E) libata(E) r8169(E) mii(E) usbcore(E) scsi_mod(E) usb_common(E) [ 1190.501686] CPU: 0 PID: 2291 Comm: Xorg Tainted: G E 4.6.0-0.bpo.1-rt-686-pae #1 Debian 4.6.3-1~bpo8+1 [ 1190.501687] Hardware name: System manufacturer System Product Name/F1A75-V PRO, BIOS 2507 01/29/2015 [ 1190.501690] 00203286 d2773a9b ee9b5e80 c12ee0c1 00000000 00000000 c107165a c1680bfc [ 1190.501692] 00000000 000008f3 c1670d4c 00000214 c103743b 00000214 00000009 c103743b [ 1190.501693] e99dafc0 e99da800 bf8404c0 ee9b5e94 c107176a 00000009 00000000 00000000 [ 1190.501694] Call Trace: [ 1190.501699] [<c12ee0c1>] ? dump_stack+0x55/0x74 [ 1190.501702] [<c107165a>] ? __warn+0xea/0x110 [ 1190.501703] [<c103743b>] ? fpu__restore+0xbb/0x160 [ 1190.501704] [<c103743b>] ? fpu__restore+0xbb/0x160 [ 1190.501706] [<c107176a>] ? warn_slowpath_null+0x2a/0x30 [ 1190.501707] [<c103743b>] ? fpu__restore+0xbb/0x160 [ 1190.501708] [<c10387ec>] ? __fpu__restore_sig+0x26c/0x530 [ 1190.501711] [<c102b939>] ? restore_sigcontext.isra.7+0xe9/0x110 [ 1190.501712] [<c102c371>] ? sys_sigreturn+0xa1/0xb0 [ 1190.501714] [<c1003870>] ? do_int80_syscall_32+0x60/0x190 [ 1190.501716] [<c1002e5f>] ? exit_to_usermode_loop+0xbf/0x120 [ 1190.501718] [<c158f81d>] ? entry_INT80_32+0x31/0x31 [ 1190.501719] ---[ end trace 0000000000000002 ]---
Last edit: 10 years 3 months ago by vre.

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9 years 9 months ago #86381 by Rolquin
Replied by Rolquin on topic Install the Preempt - Rt Kernel
HI Todd , its been a while since this post , but Im still struggling with this issue.

Finally I have been able to install the RT kernel , now boot over the new kernel , Im trying adding the buildbot to the repo files.

This is unable to fetch, Http is not found , looks like the link has been remove or maybe moved from server. The same if I try adding " deb http:// linuxcnc.org/wheezy base 2.7 -uspace "

Is there any other way to archive this ? can you please provide any help ?

Thanks.

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