Hi Ralf, On 05/08/2012 12:14 PM, Ralf Mardorf wrote: > On Mon, 2012-05-07 at 14:54 +0200, Robin Gareus wrote: >> With linux >= 3.0 and the preemt-RT patch, you don't need the >> 'threadirq' option with CONFIG_FORCE_THREADIRQ=y: OOPS. Sorry about the typos above. That should have been 'PREEMPT_RT', 'threadirqs' and 'CONFIG_IRQ_FORCED_THREADING'. >> http://anonscm.debian.org/viewvc/kernel/dists/trunk/linux-2.6/debian/patches/features/all/rt/genirq-force-threading.patch?revision=18299&view=markup > > So when I build a kernel-rt ex 3.0 from kernel.org source I need to use > boot option threadirqs, if it isn't patched? What is "kernel-rt ex 3.0" ?? https://www.kernel.org/pub/linux/kernel/projects/rt/3.[024] includes that patch. It's not debian specific but part of Thomas Gleixner's PREEMPT_RT patch. (It's just that debian's SCM viewer is the only one I know that allows to read the [PREEMT_RT split quilt queue] patches in a browser.) > On AV Linux I run the 3.0.23-avl-7-pae with and the self-build > 3.0.23-rt40 without threadirqs. This way there's no difference between > those kernels. I can't make music using JACK1 (didn't test JACK2 until > now with AV Linux). > > But at least kernel-rt < 2.6.39 are ok without threadirqs ;)? Correct. IIRC the 'threadirq' option was introduced in vanilla 2.6.39 when a large part of the tasklet-threading code was merged into Linus' tree. This option was not present for linux-kernels (incl PREEMPT_RT patched kernels) before 2.6.39. > But CONFIG_IRQ_FORCED_THREADING has to be set for a kernel-rt too? You don't really have no choice: When you configure your kernel with the PREEMPT_RT patch, PREEMPT_RT_FULL depends on CONFIG_IRQ_FORCED_THREADING and forces it anyway (PREEMPT_RT_BASE does not). > spinymouse@precise:~$ grep FORCE /media/avlinux/boot/config-3.0.23-rt40 > CONFIG_IRQ_FORCED_THREADING=y If you compile a recent kernel (>=3.0) with the PREEMPT_RT patch and set "CONFIG_IRQ_FORCED_THREADING=y", the boot-option 'threadirqs' is implied and using it makes no difference. ciao, robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
