[Jack-Devel] RT_GROUP_SCHED kernel option makes JACK unusable in Ubuntu Natty

Tue Dec 14 15:21:28 UTC 2010

On Tue, Dec 14, 2010 at 10:06 AM, Ronan Jouchet <ronan at jouchet.fr> wrote:
> On Tue, Dec 14, 2010 at 9:57 AM, Tim Gardner <tim.gardner at canonical.com> wrote:
>> On 12/13/2010 09:34 PM, Ronan Jouchet wrote:
>>>...
>>
>> I'm not opposed to disabling RT_GROUP_SCHED. After all, it _is_ marked
>> EXPERIMENTAL. Have you proven that a kernel with RT_GROUP_SCHED disabled
>> actually fixes the issues that you're seeing with JACK ?

As stated elsewhere, the issue is NOT with RT_GROUP_SCHED itself, but
its use by either userspace or some other kernel subsystem.

The root cgroup is properly RT-enabled by default, but at least on
Ubuntu, regular user tasks do not end up attached to the root cgroup.