On Mon, Mar 10, 2008 at 5:22 PM, Jonatan Liljedahl <[EMAIL PROTECTED]> wrote:
> Lucas C. Villa Real wrote:
>  > On Mon, Mar 10, 2008 at 8:17 AM, Jonatan Liljedahl <[EMAIL PROTECTED]> 
> wrote:
>  >> how was it, is the realtime lsm patch included in the gobolinux kernel?
>  >>  it's the easiest way to gain realtime privileges, another alternative is
>  >>  set_rlimits which require no kernel patch, but it means you have to run
>  >>  all apps that might ask for realtime threads under set_rlimits which can
>  >>  be hard in a desktop environment..
>  >
>  > I just checked the patch (which is 2 years old now -- does it still
>  > work?). As far as I can see, in order to apply it one would have to
>  > disable the default Linux capabilities (CONFIG_SECURITY_CAPABILITIES),
>  > which is what we've been using so far -- it's not possible to have
>  > that capabilities configured as module anymore.
>
>  Is CONFIG_SECURITY_CAPABILITIES the commoncap module? then this is
>  needed as a module for some reason, but if it can only be compiled-in or
>  not on newer kernels then we have a problem.

Yes. It used to be tristate (built-in, module or disabled), but it's
now a bool (built-in or disabled).

>  What is the preferred modern method of letting apps gain realtime
>  privileges? PAM perhaps? it as a limits.conf with a realtime variable..
>
>
>  > What about Ingo Molnar's preempt-rt patch? Isn't it an option for
>  > realtime audio? :
>  > http://www.kernel.org/pub/linux/kernel/projects/rt/
>
>  What does it do?

It improves the responsiveness of the system by making the kernel
fully preemptible and with real time capabilities, which is slowly
being integrated with mainline. There's an introductory paper on the
subject here: 
http://www.realtimelinuxfoundation.org/events/rtlws-2006/paper_33.html

The latest patch can be downloaded here:
http://www.kernel.org/pub/linux/kernel/projects/rt/

Could you please try it and share your results later on?

-- 
Lucas
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