[arch-general] audio realtime, was: /usr/bin/X: No such file

[Ralf Mardorf]

Sorry some additional Arch Linux newbie questions ;)

-----Ursprüngliche Nachricht-----
Von: arch-general-bounces at archlinux.org im Auftrag von Ionut Biru
Gesendet: So 12/11/2011 16:19
> AUR is your friend.
> 
> nvidia-lts for kernel26-lts is in extra.
> nvidia-rt from aur
> nvidia-$yourcrappykerly from aur

http://aur.archlinux.org/packages.php?ID=12132

Dependencies:
linux-rt>=3.0.0
linux-rt<3.2.0
nvidia-utils=285.05.09

So if I build a kernel myself, not by using pacman or PKGBUILD I need to
add some kind of dummy package?
I'll test one of those kernels from
https://wiki.archlinux.org/index.php/Pro_Audio#Realtime_Kernel but
usually I'm using my self build kernels only.
Btw. I can't agree with
"Tickless, CONFIG_NO_HZ, i.e "dynticks", or "dynamic ticks", is said to
interfere with realtime (though the extent may not be noticeable)."
it reduces audible MIDI jitter on my machine.

Dunno how PKGBUILD works (I'll find out soon), but reading
https://aur.archlinux.org/packages/li/linux-rt/PKGBUILD I can e.g. use
make oldconfig, but

"# remove the sublevel from Makefile
 # this ensures our kernel version is always 3.X-ARCH
 # this way, minor kernel updates will not break external modules"

What if I need e.g. 3.0.12-rt30-test1 and 3.0.12-rt30-test2 with
different configs?

Is there something equivalent to Debian's equivs?
http://www.debian.org/doc/manuals/apt-howto/ch-helpers.en.html

E.g. to remove pulseaudio, which was installed as dependency of xfce4,
or to install a self build, selected version of jack2 and to keep
dependencies.

I couldn't find Jack2 64-bit (searching the Internet from a Suse
install, didn't run packman)?! Anyway, 32-bit seems to be 1.9.7 and I
need 1.9.8, because I need the -Xalsarawmidi option. Using this option
in combination with a2jmidi_bridge I don't have any audible MIDI jitter.

> grep audio /media/archlinux/etc/security/limits.conf
@audio          -       rtprio          65
@audio          -       nice           -10
@audio          -       memlock         40000

If I edit this to different values, e.g.
http://jackaudio.org/linux_rt_config , could it be overwritten by a
package upgrade?

Cheers!

Ralf