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Maurizio De Cecco wrote:

quoted text
> I am running Ubuntu studio 64 on a Thinkpad laptop (X61s), and i get

> an horrible battery life. Powertop suggest to configure the kernel

> with CONFIG_NO_HZ=y.

>

> How does this interact with the -rt kernel (2.6.24) used in Ubuntu

> Studio ? Any good reason to don't do it ?

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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