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<H1>[Mageia-dev] mageia sound tasks</H1>
<B>Daniel Kreuter</B>
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TITLE="[Mageia-dev] mageia sound tasks">daniel.kreuter85 at googlemail.com
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<I>Fri Dec 17 18:17:25 CET 2010</I>
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<PRE>I can help you packaging after i worked myself through the rpm guides.
On Fri, Dec 17, 2010 at 5:49 PM, SaschaS <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">ungleichklang at gmail.com</A>> wrote:
><i> After having a looong chat with the guys from linux4audio and reading tons
</I>><i> of posts in ccrma forum, I must say .....
</I>><i>
</I>><i> Idea with an rt-kernel for netbooks ....... DISMISSED .... it simply makes
</I>><i> no sense.
</I>><i> Those guys mostly use gentoo and build their own kernel for years now and
</I>><i> they gave me the following hints, that also can be found in discussions of
</I>><i> other distributions:
</I>><i> 1) the kernel (without preemption-patch) should have
</I>><i>
</I>><i> Processor type and features >> Preemption Mode >> Complete Preemption (Real-Time)
</I>><i> Processor type and features >> Timer frequency >> 1000 HZ
</I>><i>
</I>><i> General setup >> RCU Subsystem >> RCU Implementation (Preemptable tree-based hierarchical RCU)
</I>><i>
</I>><i> Proccesor Type and features >> Tickless System (Dynamic Ticks) should be
</I>><i> excluded
</I>><i>
</I>><i>
</I>><i> Idea with multiple tasks .... DISMISSED ...... one task that installs
</I>><i> drivers likje ffado and stuff like Jackit and sessionhandling and .... the
</I>><i> other little stuff one needs, is a really good Idea.
</I>><i> (a big discussion should be held here on wich would be the best tools)
</I>><i> The rest, like LADSPA, DSSI, Soundfonts or apps like ardour, lmms ......
</I>><i> should not be included, it's simply too much.
</I>><i>
</I>><i> We could provide a script that adds the content we need, like:
</I>><i> 1) alter /etc/security/limits.conf
</I>><i> @audio - rtprio 99
</I>><i> @audio - memlock unlimited
</I>><i>
</I>><i> 2) add to /etc/rc.d/rc.local
</I>><i> echo 2048 >/sys/class/rtc/rtc0/max_user_freq
</I>><i> echo 2048 >/proc/sys/dev/hpet/max-user-freq
</I>><i>
</I>><i> maybe add 2 new files to /lib/udev/rules.d
</I>><i> a) 40-rtc-permissions.rules with: KERNEL=="rtc0", GROUP="audio"
</I>><i> b) 40-hpet-permissions.rule with: KERNEL=="hpet", GROUP="audio"
</I>><i>
</I>><i> On fedora ccrma, audio4linux and other forums, the musicians eaven do not
</I>><i> use the RT-Kernel anymore since 2.6.33.
</I>><i> They report that it works better without the Preemption RT Patch with the
</I>><i> stuff above and they get a really low latency (~ 2 ms) mit an old M-Audio
</I>><i> 2496 without Jack XRUNS.
</I>><i>
</I>><i> I tested these hints (exept compiling a kernel) today and it really works
</I>><i> much better.
</I>><i> I could reduce the latency on my laptop with build in soundcard from 23.2ms
</I>><i> to 5.8ms (44100 kHz)
</I>><i>
</I>><i>
</I>><i> 2010/12/17 Romain d'Alverny <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">rdalverny at gmail.com</A>>
</I>><i>
</I>>><i> On Fri, Dec 17, 2010 at 13:27, Michael Scherer <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">misc at zarb.org</A>> wrote:
</I>>><i> > Le vendredi 17 décembre 2010 à 12:35 +0100, Sascha Schneider a écrit :
</I>>><i> >> [...]
</I>>><i> >> Work to be done:
</I>>><i> >> - provide sound packages like hydrogen, ardour, jackit ......
</I>>><i> >> - provide TWO good realtimekernel, one for desktop and another for
</I>>><i> netbooks
</I>>><i> >
</I>>><i> > Given the fact that each kernel add a certain load on hdlists, I think
</I>>><i> > we should really try to avoid their proliferation.
</I>>><i> > ( kernel represent 33% of the size of contribs hdlist at Mandriva ).
</I>>><i>
</I>>><i> This is not necessarily proliferation if it has a legitimate purpose
</I>>><i> for the user needs. Maybe this could be merged with other existing rt
</I>>><i> kernels.
</I>>><i>
</I>>><i> If that makes for a really big issue for the final repository index
</I>>><i> files in the end, then it may be a good reason to have a music studio
</I>>><i> derivative distribution. Or find another solution?
</I>>><i>
</I>>><i> you are right, too many kernels is not what makes it better.
</I>><i>
</I>><i>
</I>>><i> >> - provide a script or someting like that, that scanns and adds sound
</I>>><i> >> specific stuff to the limits.conf, /etc/udev/rules.d and
</I>>><i> /etc/rc.d/rc.local
</I>>><i> >> and other places
</I>>><i> >> - provide tasks files that really only install good and necessary sound
</I>>><i> >> stuff.
</I>>><i> >
</I>>><i> > Good luck with deciding what is "good and necessary". You will always
</I>>><i> > end frustrating people whose definition of good and necessary to be
</I>>><i> > different.
</I>>><i>
</I>>><i> Nothing will ever please everyone. But it's good to have a
</I>>><i> recommandation/selection of whatever works best/best fits some
</I>>><i> purpose, to avoid having to test everything everytime to have a
</I>>><i> working setup; here a music studio.
</I>>><i>
</I>><i>
</I>><i> This might be an idea, to simply provide an iso containing the basic setup
</I>><i> like above with LXDE that uses the standard mageia repos for installation
</I>><i> and updates.
</I>><i>
</I>><i>
</I>>><i> So this may not be the best way to put it (using a rpm task), but it
</I>>><i> looks like it. Having a basic recommendation set for a particular
</I>>><i> purpose, on top of all available software in the distribution, does
</I>>><i> not sound bad to me (further than that, having a way to
</I>>><i> customize/store/retrieve this set).
</I>>><i>
</I>>><i> Althought trying new stuff is great too, there are times you prefer to
</I>>><i> focus on production and just install/restore tools that just works,
</I>>><i> without taking too much time in this.
</I>>><i>
</I>>><i> (we're not to the point of having something like a allmyapps.com
</I>>><i> equivalent though).
</I>>><i>
</I>>><i> > And secondary, I think we should also try to avoid having too much task-
</I>>><i> > rpms. Their values is in the fact they allow to quickly install a set of
</I>>><i> > rpm without searching in the whole set of rpm.
</I>>><i>
</I>>><i> Indeed.
</I>>><i>
</I>>><i>
</I>>><i> Romain
</I>>><i>
</I>><i> greetings, Sascha
</I>><i>
</I>
--
Mit freundlichen Grüßen
Greetings
Daniel Kreuter
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