[LAU] Something interesting about kernel 3.6.5-rt14

Len Ovens len at ovenwerks.net
Sat Nov 3 15:08:47 UTC 2012


On Sat, November 3, 2012 2:40 am, Ralf Mardorf wrote:
> I noticed something interesting about kernel 3.6.5-rt14.
>
> spinymouse at qrc:~$ uname -a
> Linux qrc 3.5.0-17-lowlatency #18-Ubuntu SMP PREEMPT Tue Oct 9 20:04:43
> UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
>
> spinymouse at qrc:~$ /etc/init.d/rtirq status | grep radeon
>   768 FF      50   -  90  0.0 S    irq/18-radeon
> spinymouse at qrc:~$ /etc/init.d/rtirq status | grep irq/18
>   777 FF      85   - 125  0.0 S    irq/18-snd_hdsp
>    56 FF      78   - 118  0.0 S    irq/18-ohci_hcd
>    58 FF      77   - 117  0.0 S    irq/18-ohci_hcd
>   768 FF      50   -  90  0.0 S    irq/18-radeon
>
>
> spinymouse at qrc:~$ uname -a
> Linux qrc 3.6.5-rt14 #1 SMP PREEMPT RT Fri Nov 2 21:36:37 CET 2012
> x86_64 x86_64 x86_64 GNU/Linux
>
> spinymouse at qrc:~$ /etc/init.d/rtirq status | grep radeon
>   807 FF      50   -  90  0.0 S    irq/43-radeon
> spinymouse at qrc:~$ /etc/init.d/rtirq status | grep irq/18
>   832 FF      85   - 125  0.0 S    irq/18-snd_hdsp
>    58 FF      78   - 118  0.0 S    irq/18-ohci_hcd
>    60 FF      77   - 117  0.0 S    irq/18-ohci_hcd
>
> Unfortunately it didn't solve xrun issues for the RME card. However,
> the kernel does switch to another IRQ for the graphics, for all other
> kernels on different distros, the graphics always gets IRQ18, also if I
> switch the integrated ATI with a Nvidia.

Thats strange.

In any case, I would work at getting your hdsp off of irq18. Put it in a
different slot whatever. It made a difference for my stuff in terms of
xruns or not.


-- 
Len Ovens
www.OvenWerks.net




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