[LAU] linux-rt & presonus 1818VSL

[Jeremy Jongepier]

On 07/02/2013 08:42 PM, Fero Kiraly wrote:
> I say hallo for Harry ! ;)
> 
> F:  I have some troubles - read xruns - with this setup:
> H:  There's a lot more to removing Xruns from a system than just the kernel
> and JACK settings (although they are very important :)
> F: actually I know  realTimeConfigQuickScan, so my output looks:
> 
> *[paum at bookes ~]$ realTimeConfigQuickScan *
> *== GUI-enabled checks ==*
> *Checking if you are root... no - good*
> *Checking filesystem 'noatime' parameter... 3.6.11 kernel - good*
> *(relatime is default since 2.6.30)*
> *Checking CPU Governors... CPU 0: 'performance' CPU 1: 'performance' CPU 2:
> 'performance' CPU 3: 'performance'  - good*
> *Checking swappiness... 10 - good*
> *Checking for resource-intensive background processes... none found - good*
> *Checking checking sysctl inotify max_user_watches... >= 524288 - good*
> *Checking access to the high precision event timer... readable - good*
> *Checking access to the real-time clock... readable - good*
> *Checking whether you're in the 'audio' group... yes - good*
> *Checking for multiple 'audio' groups... no - good*
> *Checking the ability to prioritize processes with chrt... yes - good*
> *Checking kernel support for high resolution timers... found - good*
> *Kernel with Real-Time Preemption... not found - not good*
> *Kernel without real-time capabilities found*
> *For more information, see
> http://wiki.linuxmusicians.com/doku.php?id=system_configuration#installing_a_real-time_kernel
> *
> *Checking if kernel system timer is set to 1000 hz... found - good*
> *Checking kernel support for tickless timer... found - good*
> *== Other checks ==*
> *Checking filesystem types... ok.*
> *ok.*
> *** Set $SOUND_CARD_IRQ to the IRQ of your soundcard to enable more checks.*
> *   Find your sound card's IRQ by looking at '/proc/interrupts' and lspci.*
> *[paum at bookes ~]$ *
> 
> 
> and I dont understand two things:
> 
> *Kernel with Real-Time Preemption... not found - not good*
> *Kernel without real-time capabilities found*
> *BUT*
> *[paum at bookes ~]$ uname -a*
> *Linux bookes 3.6.11-rt33-1-rt #1 SMP PREEMPT RT Sun Apr 28 12:18:40 CEST
> 2013 x86_64 GNU/Linux*
> *[paum at bookes ~]$ *
> 

Hello Fero,

Where did you get the realTimeConfigQuickScan script? The author updated
it a month ago so it also checks for the right CONFIG option for 3.x
kernels. And did you compile the kernel yourself?

> and the second, how to:
>  ** Set $SOUND_CARD_IRQ to the IRQ of your soundcard to enable more checks.
>    Find your sound card's IRQ by looking at '/proc/interrupts' and lspci.
> ??
> 

This only applies for onboard or PCI audio interfaces, so not for USB
and FireWire interfaces.

Regards,

Jeremy