[Mageia-dev] mageia sound tasks

Wed Dec 29 15:22:37 CET 2010

I made a couple of simple kernel tests with different Mandriva kernels to
+see if Kernel-RT is really needed or should be recommanded.
+I used the same song in same daw with qjackctl, same everything, except the
+kernel.
+I used the Hunz-Demo-song in Renoise 2.6 with low Frames in QJackctl to
+force some XRUNS on my Laptop with onboard soundcard.
+
+   - kernel-desktop-2.6.33.7-2mnb => 14 XRUNS
+   - kernel-desktop-tmb-desktop-2.6.34-10mdv => 10 XRUNS
+   - kernel-rt-2.6.33.5-1.rt23.1 => 2 XRUNS
+
+I also use the RTIRQ from Rui Nuno Capela with the Kernel-RT
+
+any other experiences??
+
+regards, saschas
+
+2010/12/22 Sascha Schneider <ungleichklang at gmail.com>
+
+> This sounds great,
+>
+> latest kernel-tmb I see in the repos (64bit) is 2.6.31
+> will test it this eve on my both mashines with my musicapps.
+>
+> Thanks Thomas
+>
+> added this kernel as an option to the wiki
+>
+> regard, saschas
+>
+> 2010/12/22 Thomas Backlund <tmb at iki.fi>
+>
+> SaschaS skrev 17.12.2010 18:49:
+>>
+>>  After having a looong chat with the guys from linux4audio and reading
+>>> tons of posts in ccrma forum, I must say .....
+>>>
+>>> Idea with an rt-kernel for netbooks ....... DISMISSED .... it simply
+>>> makes no sense.
+>>> Those guys mostly use gentoo and build their own kernel for years now
+>>> and they gave me the following hints, that also can be found in
+>>> discussions of other distributions:
+>>> 1) the kernel (without preemption-patch) should have
+>>>
+>>> Processor type and features>>  Preemption Mode>>  Complete Preemption
+>>> (Real-Time)
+>>>
+>>
+>> This is already enabled in kernel-tmb
+>>
+>>
+>>
+>>  Processor type and features>>  Timer frequency>>  1000 HZ
+>>>
+>>
+>> This is already enabled in all -desktop kernels
+>>
+>>
+>>
+>>  General setup>>  RCU Subsystem>>  RCU Implementation (Preemptable
+>>> tree-based hierarchical RCU)
+>>>
+>>
+>> This is already enabled in kernel-tmb
+>>
+>>
+>>
+>>   Proccesor Type and features >> Tickless System (Dynamic Ticks) should
+>>> be excluded
+>>>
+>>
+>> This one you can get by booting with "nohz=off" on the kernel command
+>> line.
+>>
+>> --
+>> Thomas
+>>
+>
+>
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