Kernel RT i variants

La informació més recent de la situació del realtime kernel està a:

• https://help.ubuntu.com/community/UbuntuStudio/RealTimeKernel

Hi ha una discussió a la LAU sobre els diferents kernels RT, avantatges i inconvenients, doncs el futur per a la 10.10 és incert:

Hello everybody,

Many are confused about the various realtime kernels, so here is a
reminder of the situation as of Sept. 2010 (but _please_ see
https://help.ubuntu.com/community/UbuntuStudio/RealTimeKernel , which is
more detailed and continuously updated).

***Summary***
vanilla = unpatched kernel straight from kernel.org
generic = vanilla + ubuntu sauce (it's the default ubuntu kernel)

The *soft realtime kernels, prepared by changing build-time parameters*
     preempt = generic + mild configuration to reduce latency
     lowlatency = generic + aggressive configuration to reduce latency

The *hard realtime kernels, prepared by applying a big patch* from Ingo
Molnar to the kernel source before building:
     realtime = vanilla + patch (hard to maintain and stabilize because
merging 2 pieces of code is never easy)
     rt = generic + patch (even harder to maintain and stabilize because
merging 3 pieces of code is harder than 2)

***Availability***
- for Maverick, generic will be the only kernel in the archives, thus
the default kernel for ubuntu and ubuntustudio, but Alessio has been
maintaining a PPA providing lowlatency and realtime
- for Natty or later: work is being done to include lowlatency in the
official archives and make it the default ubuntustudio kernel

I hope this clears some doubts. By the way, this confusion is only going
to get more intense at release time (less informed / technical users).
Could we include some kind of note informing users about this? Why not a
"RealTime kernel help" item in the Audio Production menu, redirecting to
the wiki page?

Good day,

-- Ronan Jouchet

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creat per Joan Quintana Compte, setembre 2010