[LAU] Musix Kernels

[Ken Restivo]

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On Wed, May 09, 2007 at 03:08:01AM +0200, Marcos Guglielmetti wrote:
> El Dom 06 May 2007 19:53, Ken Restivo escribi?:
>  | On Sun, May 06, 2007 at 12:58:16PM +0300, David Baron wrote:
>  | > Along with (a currently uninstallable rosegarden), the musix reporistory
>  | > was 2.61-rt kernels. Are these with the rt patch applied or are they
>  | > simply with 1000hz timer as some "rt" kernels are?
>  | >
>  | > Anyone used these yet?
>  |
>  | I thought it was RT-patched, downloaded, and found out that it wasn't.
>  |
>  | I ended up building a 2.6.21 with Ingo's RT patch -1, from source.  Took
>  | only a short time to build, and worked great. Yay make-kpkg.
>  |
> 
> "
> These are more relevant:
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> # CONFIG_PREEMPT_DESKTOP is not set
> CONFIG_PREEMPT_RT=y
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_SOFTIRQS=y
> CONFIG_PREEMPT_HARDIRQS=y
> CONFIG_PREEMPT_BKL=y
> # CONFIG_CLASSIC_RCU is not set
> CONFIG_PREEMPT_RCU=y
> CONFIG_RCU_TRACE=y
> 
> The PREEMPT_RT is the main thing of the "rt" patch.
> The security realtime module is realtime-lsm. Setting this here has no effect
> since it is not included in the sources but must be compiled seperately. I
> think the put that here just to tell you it is (in their estimation)
> obsolete. It still works and I do not have rlimits available. "
> 
> Thanks, see:
> 
> 
> 64studio's kernel:
> 
> cat config-2.6.17-2-multimedia-486 | grep -i preem
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> # CONFIG_PREEMPT_DESKTOP is not set
> CONFIG_PREEMPT_RT=y
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_SOFTIRQS=y
> CONFIG_PREEMPT_HARDIRQS=y
> CONFIG_PREEMPT_BKL=y
> CONFIG_PREEMPT_RCU=y
> # CONFIG_CRITICAL_PREEMPT_TIMING is not set
> 
> 
> Ok, this is the Musix's kernel:
> 
> marcos at 4[boot]$ cat config-2.6.21-rt1 | grep -i preem
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> # CONFIG_PREEMPT_DESKTOP is not set
> CONFIG_PREEMPT_RT=y
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_SOFTIRQS=y
> CONFIG_PREEMPT_HARDIRQS=y
> CONFIG_PREEMPT_BKL=y
> CONFIG_PREEMPT_RCU=y
> # CONFIG_DEBUG_PREEMPT is not set
> # CONFIG_CRITICAL_PREEMPT_TIMING is not set
> 
> 
> The only thing I dont see is: CONFIG_RCU_TRACE=y, but it's there:
> 
> cat config-2.6.21-rt1 | grep -i rcu
> # CONFIG_CLASSIC_RCU is not set
> CONFIG_PREEMPT_RCU=y
> CONFIG_RCU_TRACE=y
> 
> 
> So, I dont know why did you told the world they are not realtime patched ?why?

Probably because I screwed up. Sorry about that.


> 
> Am I missing something here?


No, it's more likely I was.

> 
> Just install it and see. But, thanks for your report.
> 

I did. Something let me to conclude it wasn't patched, but I don't remember what it was. 

> 
> On the other hand, we could not build 2.6.21 with aufs and all the RT patches, 
> see:
> 
> cat config-2.6.21 | grep -i preem
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_BKL=y
> # CONFIG_DEBUG_PREEMPT is not set
> 
> 
> Because of an error related to aufs and realtime patches, the live CD runs 
> this 2.6.21 kernel and you can install 2.6.21-rt from our repositories.
> 
> But, the performance is not too bad for a Live CD, see:
> 
> 
> Performance Tests:
> 
> PC: AMD Duron 1800 (64kb cache: too low!), 384mb RAM, HD 30GB IDE 7200 RPM, 
> Soundcard: SB Live! So: cheap hardware! Not good for this things, but, see:
> 
> Distro: Live-CD Musix GNU/Linux 1.0-r0b3
> 
> Linux Musix 2.6.21 #1 SMP PREEMPT Fri Apr 27 18:08:33 EEST 2007 i686 GNU/Linux
> 
> Desktop: Icewm + Rox-Filer (Musix's default)
> 
> Ardour 0.99.3
> 
> Recording to HD (IDE, 7200 RMP)
> 
> I am not using plugins (LADSPA)
> 
> -----------------------------------
> 
> JACK: 5.3 ms latency, 48khz
> 
> 20 mono tracks: I can play or record 20 mono tracks without problems at all, 
> no xruns, no stop.
> 
> -----------------------------------
> 
> JACK: 2.7 ms latency, 48khz
> 
> 20 mono tracks: I can play or record 20 mono tracks without problems at all, 
> no xruns, no stop.
> 
> ------------
> 
> Less latency: my SB Live! does not allow me to lower the latency less than 
> 2.7ms when JACK is in Duplex mode, but I can lower it if I choose only 
> playback from the qjackctl setup.
> 
> ----------------------------------------
> 
> JACK: 42,7 ms latency, 48khz
> 
> 39 mono tracks into Ardour: OK, no xruns... sometimes Ardour stop and 
> says "your machine is not fast enought...etc", but it happends when I move 
> some slider into Ardour or something like this. If I just record or play, 
> there are no problems.
> 
> I have to do more tests, but it woud be useful to use better hardware for them
> 

Nice work!

- -ken
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