New subject: [Fwd: Re: realtime kernel for Debian]

25 Mar 2009

Hi,

Sorry, but I've to call again...

The developers seems very willing to include a realtime kernel there 
repo. They need some people who wants to build and maintain it. This is 
really  a chance  for  linux audio, especially on Debian.  *This is the 
moment!*

So please consider to offer your help in building, maintaining  and/or 
testing!

Thanks in advance,

\r

Grammostola Rosea wrote:
...
  Grammostola Rosea wrote:
  Hi,

 There is an promising discussion on the debian-dev mailinglist. Maybe 
 some people who knows more about realtime kernels could join. Also 
 users who might want to have an realtime kernel in Debian and/or want 
 help testing could join the discussion. I think it would be nice if 
 there is also an realtime kernel in Debian or that the default kernel 
 would be improved for realtime (audio) usage.

 http://www.debian.org/MailingLists/subscribe  Here is the thread about a realtime
kernel in Debian:

 http://www.linux-archive.org/debian-development/268999-realtime-kernel-debi… 

 Kind regards,

 \r

 \r

 ------------------------------------------------------------------------

 Subject:
 Re: realtime kernel for Debian
 From:
 "Giacomo A. Catenazzi" &lt;cate(a)debian.org&gt;
 Date:
 Tue, 24 Mar 2009 13:26:35 +0100
 To:
 debian-devel(a)lists.debian.org

 To:
 debian-devel(a)lists.debian.org

 Raphael Hertzog wrote:
  On Tue, 24 Mar 2009, Giacomo A. Catenazzi wrote:
  Do you really need real time kernel?
 Debian is a technical driven project, but reading the previous two 
 quotes,
 "real time" is used as marketing thing. 
 It's good to question the use of any feature, but a real-time kernel is
 certainly very useful in many industrial applications and Debian is
 popular in that field. (Don't put a marketing label on anything where
 you are not yourself sure of your expertise.) 
 Yes, I didn't write very well my sentence: the previous quotes was more
 about "there exist rt kernels", "ubuntu has a rt kernel", but not
solid
 requirements. I had to write some "seems", and I'm sorry for the two
 quoted people if it seems an attack.
 Anyway, later in the mail, I asked for precise needs, so we could see
 better what we should improve.

 IMHO most users want a low latency kernel, but not a slower kernel, so
 a CONFIG_HZ_1000 would be nice.  But the original post was about
 multimedia production (and not reproduction), so the needs are probably
 other.

 My point was more:
 - Debian has not rt kernel. Why? Non DD interested or/and low demand?
   This is an important point. We must not produce a rt-kernel if
   we cannot provide testers and developers (in unstable).
 - kernel management is a weak point in distribution: no good method
   for kernel dependencies, using full capabilities, ...

 so IMHO we should try harder with the normal kernel, so that we
 can use the same infrastructure and testers. If we fail and we
 are able to support rt kernels, IMO it is good to provide it in Debian.

 The original mail was about "multimedia production" and few year ago 
 kernel
 developers had a lot of interaction with music industries.
 I'm not an expert in the field, but how far are we in their need with
 standard kernels?)

  I do use a real-time kernel on a Debian based
system for one of my
 customers (but I have to recompile the kernel anyway because I do other
 customizations) and I have good reasons to do so because I can't suffer
 serial overrun and I must ensure that the serial interrupt handler
 is run in the required time and that no other (kernel) task has higher
 priority. 
 These *other customizations* are important to rt-kernel. So we need
 a person (or more) that know the needs and could support us.
 "realtime" alone is only a label ;-)

 ciao
     cate

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