[PlanetCCRMA] RT vs standard Fedora kernel

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Sun Jan 29 10:18:36 PST 2012

On 01/29/2012 03:11 AM, Martin Tarenskeen wrote:
> Hi,
> I am on Fedora 16.
> I have installed kernel-rt 3.0.17-1.rt33.1.fc16.ccrma and the normal
> kernel-3.2.2-1.fc16 from Fedora.
> If I boot with the RT kernel from PlanetCCRMA, start Jack (I use qjackctl
> for that) with RT enabled, and if I then start a synth like hexter or
> zynaddsubfx via the commandline, I am seeing a message that realtime
> scheduling is not allowed or something like that, but the thing does
> start. And I am getting a lot of xruns.

Could you try installing this?:


   "yum install planetccrma-rt-permissions-all"

The required priority for the rt patched kernels is greater than the 
default rt scheduling priority that the normal jack and kernel allows 
and that is why it fails for you.

You will need to logout and login again after installing the package.
Hope it helps...

-- Fernando

> If I boot the standard Fedora kernel and do exactly the same everything
> works fine, and I am not getting these error messages.
> Shouldn't the RT kernel perform BETTER than the standard kernel ?
> Obviously for Fedora 16 this still is not the case.

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