[LAU] linux-rt & presonus 1818VSL

[Jeremy Jongepier]

On 07/02/2013 08:27 PM, Robin Gareus wrote:
> On 07/02/2013 07:49 PM, Harry van Haaren wrote:
>> On Tue, Jul 2, 2013 at 5:53 PM, Fero Kiraly <fero.kiraly at gmail.com> wrote:
>>> I have some troubles - read xruns - with this setup:
>> There's a lot more to removing Xruns from a system than just the kernel and
>> JACK settings (although they are very important :)
> 
>  * linux 3.2.35-2 PREEMPT RT
>    (debian's RT kernel recompiled with VSL1818 clock selector fix added)
>  * jackd 1.9.10 (git)
>  * Rui's rtirq script
>  * jackd with -p64 -n2 (actually jackdbus)

Hi Robin,

So with and USB2.0 audio interface like the 181VSL using -n2 yields a
stable setup too, no need anymore to use -n3?

>  * presonus 1818VSL
> 
> -> very reliable no x-runs
> 
>> Known things that need to be done:
>> -Interrupt requests of your hardware must be prioritized (rtirq script
>> helps here)
>> -Interrupt thread handlers (on RT kernel) must be prioritized
>> -Thread priorities must be checked for JACK itself
> 
> +1, +1, +1
> 
>> Some other things to look into are:
>> -CPU scaling (causes Xruns here, although others say it works fine)
> 
> no problem here w/freq scaling. I have disabled C1E halt states and EIST
> in the Bios, though.
>

I have yet to encounter a BIOS that has these options.

Regards,

Jeremy