[PlanetCCRMA] [PlanetCCRMANews] the Planet lands on Fedora 10

Tue Dec 2 00:34:24 PST 2008

I was not aware of this at all, but I guess it adds to the feeling that
desktop Fedora/Linux has passed the pro-audio stage and doesn't want to come
back. This is a huge shame for me, because a kernel with that patch makes
all the difference to getting a "musical" latency and no x-runs (all round
better audio performance). I'd rather have that than a new kernel. (But if I
had new hardware?, I guess I'd rather have the new kernel.)

Who is the author of the actual patch? Are they interested?

Anyone got a spin of Fedora 8 handy?

On Tue, Dec 2, 2008 at 9:14 AM, Fernando Lopez-Lezcano <
nando at ccrma.stanford.edu> wrote:

> On Mon, 2008-12-01 at 14:41 -0700, David Nielson wrote:
> > I think it's time to get Linus' attention. The hard hang bug is a kernel
> > regression. MIDI not working with ALSA is a kernel regression. Linus has
> > said many times that a regression is a thousand times worse than any
> > other bug, so if kernel devs aren't paying attention, I say it's time to
> > do an end-run around them and go to a higher authority.
>
> Well, that would be the right approach if the rt patch were to be part
> of the standard kernel tree. Regretfully it is not, so I doubt it would
> have much effect.
>
> I have not had the time to try to see what is going on with the hard
> hangs (set up a serial console and something to receive it, etc, etc,
> etc). So I have not posted on lkml about the hangs. I think you need to
> have some hard data before doing that, otherwise what is the point?
>
> > But re: Practicality, is it best for now to use F8 with the 2.6.24 CCRMA
> > kernel? I will be building a new system in about a week, and stability
> > is the most important thing right now.
>
> I guess that would be the most stable thing to run. Depending on how low
> latency it is you actually need you could also run the regular Fedora
> kernel on f9 or 10.
>
> -- Fernando
>
>
> > Thanks for all you're doing.
> >
> > David
> >
> > Fernando Lopez-Lezcano wrote:
> > > On Mon, 2008-12-01 at 12:58 -0500, Hector Centeno wrote:
> > >
> > >> I wonder what are the latest news about the issues with the RT kernel?
> > >> It seems to me that all recent distros are struggling with it and I
> > >> remember reading some thread in LKML a few months ago. Will it be
> > >> possible to have a RT kernel in Fedora 10 any time soon? (I'm not
> > >> pressuring, just wondering about getting some info to plan my
> > >> upgrades).
> > >>
> > >
> > > The current status (for Planet CCRMA + Fedora) is as follows:
> > >
> > > The rt patches available online are:
> > >
> > > 2.6.24.7-rt21
> > > 2.6.26.6-rt11 (last updated October 13th)
> > > [http://www.kernel.org/pub/linux/kernel/projects/rt/]
> > >
> > > That hints as to the status of the rt patch :-(
> > > How do they interact with Fedora >= 9?
> > >
> > > 2.6.24.7-rt21: stable and the one I would use, except for the fact that
> > > the new X server in >= fc9 don't like something in the "old" 2.6.24
> > > kernel and segfault every once in a while, taking the whole session
> with
> > > it. Not usable unless you downgrade X to the one that comes with Fedora
> > > 8 (I tried it and that appears to work but it is not very practical).
> > >
> > > 2.6.26.6-rt11: that seems to mostly work but I have seen this kernel
> > > hang hard. Not very often but it happens. The big problem (other that
> > > the hangs) that I have with that one is that external midi interfaces
> > > don't work when accessed through the alsa sequencer api. So, your midi
> > > keyboard can't be used to control software synthesis, for example. I
> > > tried to tickle kernel gurus to pay attention to this one but almost
> > > nobody responded to my posts in lkml. One suggestion made midi input
> > > work but the internal timer in the alsa seq api is not working (I have
> > > not had time to try to get that fixed - maybe this week).
> > >
> > > You may notice there is _no_ realtime preemption patches for 2.6.27.x
> > > yet (and 2.6.28 is already in the rc status stage!). At least not in
> the
> > > official web site. There is a tree somewhere I tried but at least for
> me
> > > that did not result in a bootable kernel.
> > >
> > > So.... back to the original question:
> > >
> > > I could (and probably will) release a 2.6.26.x based rt kernel for fc10
> > > soon, with the above mentioned caveats... (so not very usable).
> > >
> > > Right now I'm just running Fedora's kernel on my fc10 test machine....
> > > :-(
> > >
> > > [the Fedora kernel developers are not interested in the rt patches and
> > > currently RedHat's GRM kernel _is_ based on 2.6.24[*], so I don't
> > > anticipate much change coming soon, the relevant gurus are not working
> > > in up to date patches AFAICT]
> > >
> > > -- Fernando
> > >
> > > PS: That's the realtime commercial offering from RedHat and presumably
> > > what Ingo is working on, see here:
> > >
> http://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/RHEMRG/SRPMS/
> > >
> > >
> > >
> > >
> > >> On Sat, Nov 29, 2008 at 2:12 PM, Steve Harris <swh at ecs.soton.ac.uk>
> wrote:
> > >>
> > >>> I've just tried it, on a machine with with a fresh FC10 install, all
> > >>> seems to work fine.
> > >>>
> > >>> - Steve
> > >>>
> > >>> On 26 Nov 2008, at 22:32, Fernando Lopez-Lezcano wrote:
> > >>>
> > >>>
> > >>>> Well, in tune with the universe Planet CCRMA crash lands its tiny
> > >>>> landing craft on Fedora 10. Luckily no casualties ('cause nobody has
> > >>>> tried to run it!) After a rebuild marathon there are quite a few
> > >>>> packages available for brave souls to test drive, and a few
> stragglers
> > >>>> still on the way.
> > >>>>
> > >>>> So far _only_ in the 'planetccrma' repository.
> > >>>> No planetcore packages yet[*].
> > >>>>
> > >>>> Having not tested it I can't really recommend it :-)
> > >>>> This shows what's there:
> > >>>>
> > >>>>
> http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/10/i386/repoview/index.html
> > >>>>
> http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/10/x86_64/repoview/index.html
> > >>>>
> > >>>> doing:
> > >>>>
> > >>>> rpm -Uvh
> > >>>>
> http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/10/i386/planetccrma-repo-1.1-2.fc10.ccrma.noarch.rpm
> > >>>>
> > >>>> (all in one line) should get you started...
> > >>>>
> > >>>> CAVEAT: the Jack on the Planet on fc10 is jackmp 1.9.1! It should
> work
> > >>>> fine, let me (and Stefan on the jack-devel list) know otherwise. It
> > >>>> should override the lame 0.109.2 that still comes with Fedora and
> > >>>> set up
> > >>>> permissions so that any user will have the right to use the realtime
> > >>>> scheduler (you will have to log out and login again for that to take
> > >>>> effect!).
> > >>>>
> > >>>> Enjoy! (if possible).
> > >>>> -- Fernando
> > >>>>
> > >>>> [*] the kernel situation has seen no changes...
> > >>>>
> > >
> > >
> > > _______________________________________________
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> > > PlanetCCRMA at ccrma.stanford.edu
> > > http://ccrma-mail.stanford.edu/mailman/listinfo/planetccrma
> > >
> > >
> >
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>
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