Hello
>
> On 04/03/2011 08:44 AM, Victor henri wrote:
> > It seems that the -generic kernel in Ubuntu 10.10 (and 11.04) is not very
> > appropriate for that, since the RT_GROUP_SCHED option in the kernel is
> > enabled; it means that it overrides everything that may have been
> > configured in the limits.conf. See jackd FAQ :
> > http://jackaudio.org/linux_group_sched
> > This seems specific to Ubuntu (according to Jackd FAQ); so it's probably
> > worth to have a try, but you shouldn't be surprised if you have a lot of
> > Xruns. Then you should considerr other options (see below)
> >
>
> The cgroups thing is no longer an issue. The information on Jacks page
> is no longer up to date. We should ask them to remove that part from
> their FAQ.
>
> 10.10 was never affected.
But when I 'sudo make menuconfig' in the
/usr/src/linux-headers-2.6.35-22-generic directory (or the -28-generic) the
RT_GROUP_SCHED option is enabled...
On 11.04 kernel version 2.6.37 was not usable
> without having to recompile it, but the kernel in Natty is now 2.6.38,
> which includes a patch that removes this problem.
Is a patch needed for that? Is it not enough to disable the RT_GROUP_SCHED
option then compile or recompile?
>
> The performance on 2.6.38 has been going up and down during the
> development of Natty. At the moment, it is not bad, though not perfectly
> reliable.
> Alessio Boganis PPA includes a -lowlatency kernel for Natty, which
> performs virtually as well as a -realtime kernel would, for *most* people.
Yes indeed, I've noticed that; It was such a big and nice surprise to see that
a 2.6.37 or 2.6.38 preempt could do almost the same job as a realtime kernel
(at least for what I do)
>
> --
> ailo
>
Victor
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