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

[David Nielson]

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.

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.

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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