[LAU] Rt construction area

Ralf Mardorf ralf.mardorf at alice-dsl.net
Fri Jul 8 18:45:29 UTC 2016


Hi,

is there any chance to get an old rt kernel running, by downgrading
something or changing some settings, if this error happens [1]?

It doesn't happen with a newer kernel [2], but newer kernels are not
necessarily running good on my machine.

I also wonder, when the location /sys/bus/pci/drivers/ohci_hcd/unbind
changed to /sys/bus/pci/drivers/ohci-pci/unbind [3].

Regards,
Ralf



[1]
[root at archlinux rocketmouse]# uname -rm 
3.10.61-rt65-1-rt-lts x86_64
[root at archlinux rocketmouse]# rtirq status 

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
[snip]	
  202 FF      50   -  90  0.0 S    irq/18-snd_hdsp	
[snip]	

[root at archlinux rocketmouse]# rtirq stop
[root at archlinux rocketmouse]# rtirq start
chrt: failed to set pid 202's policy: Function not implemented
Setting IRQ priorities: start [snd_hdsp] irq=18 pid=202 prio=90: FAILED.


[2]
[root at archlinux rocketmouse]# uname -rm 
4.5.4-1-ARCH x86_64
[root at archlinux rocketmouse]# rtirq status 

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
  323 FF      90   - 130  0.0 S    irq/18-snd_hdsp	
[snip]

[root at archlinux rocketmouse]# rtirq stop
[root at archlinux rocketmouse]# rtirq start
Setting IRQ priorities: start [snd_hdsp] irq=18 pid=323 prio=90: OK.


[3]
[root at archlinux rocketmouse]# echo -n "0000:00:13.2" > /sys/bus/pci/drivers/ohci_hcd/unbind
bash: /sys/bus/pci/drivers/ohci_hcd/unbind: No such file or directory
[root at archlinux rocketmouse]# echo -n "0000:00:13.4" > /sys/bus/pci/drivers/ohci_hcd/unbind 
bash: /sys/bus/pci/drivers/ohci_hcd/unbind: No such file or directory
[root at archlinux rocketmouse]# rtirq status

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
  323 FF      90   - 130  0.0 S    irq/18-snd_hdsp	
[snip]	
  144 FF      50   -  90  0.1 S    irq/17-ohci_hcd	
  146 FF      50   -  90  0.0 S    irq/18-ohci_hcd	
  147 FF      50   -  90  0.0 S    irq/17-ohci_hcd	
  148 FF      50   -  90  0.0 S    irq/18-ohci_hcd	
[snip]

[root at archlinux rocketmouse]# echo -n "0000:00:13.4" > /sys/bus/pci/drivers/ohci-pci/unbind 
[root at archlinux rocketmouse]# echo -n "0000:00:13.2" > /sys/bus/pci/drivers/ohci-pci/unbind 
[root at archlinux rocketmouse]# rtirq status

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
  323 FF      90   - 130  0.0 S    irq/18-snd_hdsp	
[snip]	
  144 FF      50   -  90  0.1 S    irq/17-ohci_hcd	
  147 FF      50   -  90  0.0 S    irq/17-ohci_hcd	
[snip]


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