[PlanetCCRMA] XRUNS and more

Etienne Rouge etiennerouge at yahoo.com
Fri May 13 09:14:33 PDT 2016

Thanks for the quick reply. I really appreciate !

I run Renoise with vanilla plugins.

- CPU Intel(R) Core(TM) i5-2500 CPU @ (quad 3.30GHz)
- 16gb ram

It should be more than enough.

I have edited /etc/sysconfig/rtirq  with :
RTIRQ_NAME_LIST="rtc firewire_ohci" (and haven't touched the rest made 
by rncbc)

I'm not sure it has done anything...

I'll try your script and I'll tell you how it goes.



Le 13/05/2016 à 17:43, Fernando Lopez-Lezcano a écrit :
> On 05/13/2016 05:15 AM, Etienne Rouge wrote:
>> Hello,
> Hi Etienne,
>> I've recently switched back to CCRMA and I'm rather happy with it.
>> However I still have xruns when I really shouldn't (powerfull computer
>> and reasonnable amount of tracks/effects).
>> I've set up PAM…  added "rtc firewire_ohci" to the irq file. Honestly, I
>> don't quite understand the few tuts I find online and the fact they are
>> not fedora-oriented don't help.
>> Is there a crucial step I've missed ? A tutorial I can follow ?
> Could you tell us what hardware is this? What software are you 
> running? I presume you are running rtirq and you have access to 
> SCHED_FIFO rt scheduling in your account.
> I have found that for critical low latency work using recent hardware 
> I need to disable hyperthreading (the fake cores on Intel processors 
> that can't do much) and also set the intel_pstate driver to try to use 
> all cores at high speed. Also disable thermald if you are using it (it 
> could also be throttling the processors). Maybe this would help?
> I have this in a script I run when needed (this is on a four core 
> Intel laptop with HT):
> # get all processors to run fast all the time...
> echo "100" > /sys/devices/system/cpu/intel_pstate/min_perf_pct
> # turn off hyperthreading which only makes things worse most of the time
> # we do this by turning off cpus that have the same "proc id"
> echo 0 > /sys/devices/system/cpu/cpu1/online
> echo 0 > /sys/devices/system/cpu/cpu3/online
> echo 0 > /sys/devices/system/cpu/cpu5/online
> echo 0 > /sys/devices/system/cpu/cpu7/online
> Best luck! And let us know how it works out...
> -- Fernando

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