Has anyone looked into what Ubuntu Studio is doing with the lowlatency
kernel? Would it be feasible to include a similarly configured kernel in
Fedora?
On 11/13/2014 10:59 AM, Brian Monroe wrote:
I think so too, thanks for chiming in.
I'm still waiting to get into the packagers group, but I have a koji
account and theoretically could compile an rt kernel. I think the
standard naming schema in other distros is kernel-rt. It should be
only adding a few lines to the spec file to enable the rt kernel, but
when you look at how many kernel update there are for Fedora every
week, I'm not sure as to how up to date we'll be able to keep up due
to the work load. We're already are down on developers, and people
like Brandon are keeping us afloat.
Are we going to be ok as a project to be behind a week or two in
Kernel releases? Personally I'm for more stable kernels when it comes
to music production vs. having the latest and greatest, but I also
think that should be a clearly indicated as a feature
That being said, I feel strongly as though others should take this
task on, if not me, then someone else or better yet, a few of us.
I'm looking into the Ubuntu Studio and turns out they dropped the RT
kernel as default. They're using a "lowlatency" kernel instead of a rt
kernel (though they do still supply an rt kernel but not by default).
I do know that users are able to get 1.5 ms latency with zero xruns so
I'm guessing they're doing something other than real-time scheduling,
I just don't know what. Thoughts?
On Wed Nov 12 2014 at 10:40:44 AM Be Ing <be.0(a)gmx.com
<mailto:be.0@gmx.com>> wrote:
Hello Fedora musicians, I've been lurking this list for a little
bit and this is my first time chiming in on something.
I think it is important to pursue an official realtime kernel for
Fedora. I think a distribution focused on audio without a realtime
kernel would have a serious bug, that IMO, would be worth delaying
publication for.
>So I had a beer with hansomepirate(jdulaney), who is, or was on
the kernel
sig, last night and we got to talking about a RT kernel.
>
>Last time we talked to the kernel folks about an rt kernel, they
weren't
impressed with the "need" for Fedora, but that was before the Spin was
officially out.
>
>Now might be a good time to raise this issue again? I dug through my
archives and found this thread. Now that we have an actual spin
that's out,
we can actually redo some of the testing to have more realistic tests.
(multitrack with effects)
>
>I feel like right now, it's one of the few benefits that the
ubuntu studio
folks have (or at least claim to have) over us. The other is some
semi-proprietary software that on... you know what, never mind
it's getting
off topic.
>
>Anyways, does the list think this is worth pursuing?
>
>>On Wed Feb 22 2012 at 9:10:29 PM Brian Monroe <briancmonroe at
gmail.com
<
http://gmail.com>[https://admin.fedoraproject.org/mailman/listinfo/mus...
wrote:
>>
>> Ok, I redid all the tests, while the system was only running my
DE and the
>> test, and then again when I put it under duress by running a
script that
>> looped "du -h /" and "ls -Ral /usr/" over and over. I
ran the
script twice
>> to get my proc up a bit to emulate running some intese delays
and reverbs
>> or other effects.
>>
>> Ironically the kernels typically did better when the scripts
were running.
>> Personally I think there's a clear advantage with CCRMA's
kernel or even
>> just a preempt kernel in the max lat areas. Those max numbers
jumped up
>> close to where they were near the beggining of the test if
anyone was
>> wondering.
>>
>> Here's the file with both sets of tests and the uname -a info
as requested
>> by Fernando.
>> -Brian
>>
>>> On Wed, Feb 22, 2012 at 6:54 AM, Brian Monroe <briancmonroe at
gmail.com
<
http://gmail.com>[https://admin.fedoraproject.org/mailman/listinfo/music]
>>> wrote:
>>> I'll be sure to include that on the next batch. I used the
kernel you
>>> after installing the CCRMA repo when you use yum install
kernel-rt, which
>>> happens to be 3.0.17-1.rt33.1.fc16.ccrma.x86_64.rt. I'll go
back and
>>> include the other info to the old results when I do the load
testing
>>> tonight or tomorrow.
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