From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grammostola Rosea Subject: Re: [Fwd: Re: realtime kernel for Debian] Date: Wed, 25 Mar 2009 11:37:54 +0100 Message-ID: <49CA0982.5090404@gmail.com> References: <49C8FF4D.1040204@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit To: pkg-multimedia-maintainers@lists.alioth.debian.org, linux-audio-user , linux-rt-users@vger.kernel.org, 64studio-devel@lists.64studio.com, Musix Return-path: Received: from smtpq2.gn.mail.iss.as9143.net ([212.54.34.165]:35796 "EHLO smtpq2.gn.mail.iss.as9143.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753469AbZCYKlK (ORCPT ); Wed, 25 Mar 2009 06:41:10 -0400 In-Reply-To: <49C8FF4D.1040204@gmail.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: 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-debian.html Kind regards, \r > > \r > > ------------------------------------------------------------------------ > > Subject: > Re: realtime kernel for Debian > From: > "Giacomo A. Catenazzi" > Date: > Tue, 24 Mar 2009 13:26:35 +0100 > To: > debian-devel@lists.debian.org > > To: > debian-devel@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 > >