Re: [LAT] Tickless kernel and realtime

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To: Maurizio De Cecco <jmax@...>
Cc: <linux-audio-tuning@...>
Date: Monday, September 15, 2008 - 5:00 pm

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Maurizio De Cecco wrote:

I can't think of any. On the contrary with NO_HZ an X60s can get down to
under 10W. I'm using tickless realtime kernels ever since the NO_HZ
option was available. At 2.6.19 I measured MIDI latency/jitter around
1kHz/1ms using NO_HZ on i686.
Audio I/O works just fine on tickless 2.6.24-rt - there are no X-Runs
with JACK under normal operation even down to 256fpp on USB.

> And in case, where i find the ubuntu studio kernel source ?

I have no idea ;) you can try `apt-cache search kernel | grep 2.6.24`
and `apt-get install linux-source-2.6.24...`

Instead of compiling your own, you can also try to use the kernel from
64studio (it's also debian based) which IIRC is tickless:
http://apt.64studio.com/64studio/stable/pool/main/l/linux-2.6/
install with `sudo dpkg -i linux-image...deb` - You can find more
information on compiling and post-compilation setup notes here:
http://64studio.com/node/504

Maybe you also find the config and patches from pure-dyne useful. They
use ubuntustudio-kernel patches and provide diffs that works with a
vanilla kernel from kernel.org - see
https://code.goto10.org/projects/puredyne/browser/live/kernel/2.6.24

HTH,
robin
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Messages in current thread:
[Linux-audio-tuning] New Linux-audio-tuning mailing list, Daniel James, (Tue Jul 29, 11:43 am)
[LAT] Tickless kernel and realtime, Maurizio De Cecco, (Fri Sep 12, 1:20 pm)
[LAT] RT patch not needed for new kernels (?), Grammostola Rosea, (Wed Nov 26, 11:07 pm)
[LAT] Fwd: [LAU] Are RT-patches needed anymore? (Was Re: &gt..., Lars-Erik Helander, (Mon Feb 2, 7:36 pm)
[LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 6:52 pm)
Re: [LAT] Setting up a performance synth, Brian Bergstrom, (Thu Jan 14, 6:17 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Thu Nov 3, 8:22 pm)
Re: [LAT] 2.6.29-rt1, Fernando Lopez-Lezcano, (Thu Mar 26, 8:40 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 9:21 pm)
Re: [LAT] 2.6.29-rt1, Fernando Lopez-Lezcano, (Fri Mar 27, 5:23 pm)
Re: [LAT] 2.6.29-rt1, , (Fri Mar 27, 7:09 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Fri Mar 27, 5:27 pm)
Re: [LAT] 2.6.29-rt1, , (Fri Mar 27, 12:57 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Fri Mar 27, 12:59 pm)
Re: [LAT] 2.6.29-rt1, Grammostola Rosea, (Fri Mar 27, 1:02 pm)
Re: [LAT] 2.6.29-rt1, , (Thu Mar 26, 8:13 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 8:30 pm)
Re: [LAT] [LAU] RT patch not needed for new kernels (?), Fernando Lopez-Lezcano, (Wed Nov 26, 11:45 pm)
Re: [LAT] Tickless kernel and realtime, Robin Gareus, (Mon Sep 15, 5:00 pm)
Re: [LAT] Tickless kernel and realtime, Daniel James, (Tue Sep 16, 9:36 am)
Re: [LAT] Tickless kernel and realtime, Jaromír Mikeš, (Wed Sep 17, 10:36 pm)
Re: [LAT] Tickless kernel and realtime, Robin Gareus, (Thu Sep 18, 2:47 pm)
Re: [LAT] Tickless kernel and realtime, Jaromír Mikeš, (Thu Sep 18, 7:42 pm)
Re: [LAT] Tickless kernel and realtime, Emanuel Rumpf, (Sun Sep 14, 12:38 pm)