Real time kernel 3-10-75-rt80 (PREEMPT_RT)

[chlorisdroid]

Hi,
today I got the 3-10-75-rt80 full preemptive kernel booting on the odroid-c1.
https://blog.georgmill.de/2015/05/27/fu ... odroid-c1/
UPDATE:
http://forum.odroid.com/viewtopic.php?f=112&t=15878

[robroy]

Nice! Have you tried it with any sound recording software?

[chlorisdroid]

Yes,

Code: Select all

arecord --buffer-time=500000 -D plughw:1,0 -t wav -c 2 -f S32_LE -r 44100 some_file.wav

produces a testfile which can be played with

Code: Select all

aplay --buffer-time=500000 -D plughw:1,0 -t wav -c 2 -f S32_LE -r 44100 some_file.wav

.
Will give jackd2 and some midi instruments a chance tomorrow.

[robroy]

Awesome! Let's work together on producing a 14.04.2 version of the Smooth Groove community image PM me and I will share details.

[chlorisdroid]

Thanks for the offer. Here is a detailed test with the rt-kernel and ardour and zynaddsubfx in conjunction with jackd2 on your standard ubuntu 14.04 image. My version of zynaddsubfx is a really new one which I compiled myself for the odroid-c1.
The rest is available from your repos. See in detail here ->
https://blog.georgmill.de/2015/05/28/ar ... odroid-c1/

[chlorisdroid]

The kernel sources are available now from my website
https://blog.georgmill.de/2015/05/27/fu ... odroid-c1/

[origin]

Hi,
I have tried your kernel sources and compiled it on my odroid c1. But it seems the ethernet port do not work well,very low throughput with iperf and also not very stable.
Do you have any idea on how to fix it?

Thanks.

[chlorisdroid]

Afaik this is a known problem due to the realtime preemtive patches, but I'm not sure about that. I don't use the ethernet port together with the realtime kernel. The only working solution I found so far is using a wifi stick. Maybe the problem will be solved in the future. But I do not have time enough at present to investigate and solve that problem. Sorry. Maybe there is someone out there who has more knowledge and time to solve that.