[LAU] Rt construction area

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@email-addr-hidden rocketmouse]# uname -rm
3.10.61-rt65-1-rt-lts x86_64
[root@email-addr-hidden 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@email-addr-hidden rocketmouse]# rtirq stop
[root@email-addr-hidden 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@email-addr-hidden rocketmouse]# uname -rm
4.5.4-1-ARCH x86_64
[root@email-addr-hidden rocketmouse]# rtirq status

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

[root@email-addr-hidden rocketmouse]# rtirq stop
[root@email-addr-hidden rocketmouse]# rtirq start
Setting IRQ priorities: start [snd_hdsp] irq=18 pid=323 prio=90: OK.

[3]
[root@email-addr-hidden 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@email-addr-hidden 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@email-addr-hidden 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@email-addr-hidden rocketmouse]# echo -n "0000:00:13.4" > /sys/bus/pci/drivers/ohci-pci/unbind
[root@email-addr-hidden rocketmouse]# echo -n "0000:00:13.2" > /sys/bus/pci/drivers/ohci-pci/unbind
[root@email-addr-hidden 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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Received on Sat Jul 9 00:15:01 2016