2.6.3x-rty where x > 3 and y >= 1?

2.6.3x-rty where x > 3 and y >= 1?

[Fernando Lopez-Lezcano]

I'm curious, any plans for an rt patch for current kernels? Anything in 
the works? 2.6.33.x is getting to be really old... the question keeps 
popping up but I have heard nothing from the rt gurus...

-- Fernando "ready to test"

Re: 2.6.3x-rty where x > 3 and y >= 1?

[Thomas Gleixner]

On Wed, 10 Nov 2010, Fernando Lopez-Lezcano wrote:

> I'm curious, any plans for an rt patch for current kernels? Anything in the
> works? 2.6.33.x is getting to be really old... the question keeps popping up
> but I have heard nothing from the rt gurus...

Working on it :)

Re: 2.6.3x-rty where x > 3 and y >= 1?

[Niccolò Belli]

Il 10/11/2010 21:54, Thomas Gleixner ha scritto:
> Working on it :)

Glad to hear that, I can't use 2.6.33-rt anymore because of problems
with my intel video card and my band is starting to blame because of xruns.

Darkbasic

Re: 2.6.3x-rty where x > 3 and y >= 1?

[Ng Oon-Ee]

On Thu, 2010-11-11 at 15:56 +0100, Niccolò Belli wrote:
> Il 10/11/2010 21:54, Thomas Gleixner ha scritto:
> > Working on it :)
> 
> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
> with my intel video card and my band is starting to blame because of xruns.
> 
> Darkbasic

In the meantime, the -bfs kernel does improve the situation somewhat.

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Re: 2.6.3x-rty where x > 3 and y >= 1?

[Bernardo Barros]

I'm trying to install the 2.6.36-bfs here, let's see what happens.. :-)

2010/11/11 Ng Oon-Ee <ngoonee@gmail.com>:
> On Thu, 2010-11-11 at 15:56 +0100, Niccolò Belli wrote:
>> Il 10/11/2010 21:54, Thomas Gleixner ha scritto:
>> > Working on it :)
>>
>> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
>> with my intel video card and my band is starting to blame because of xruns.
>>
>> Darkbasic
>
> In the meantime, the -bfs kernel does improve the situation somewhat.
>
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Re: 2.6.3x-rty where x > 3 and y >= 1?

[jordan]

hehehe,

> I'm trying to install the 2.6.36-bfs here, let's see what happens.. :-)

i know what happens at my end. - i can use 2.6.36 for RT type tasks,
as i set that kernel up 2 days ago.
im still holding onto 2.6.35 though, as it is my best kernel, has my
Wacom running, and rgba.
So far though, 2.6.36 seems not too much different from 2.6.35 for my
pro-audio usage.
I may wait for 2.6.37-bfs before i re-install Wacom, rgba, etc.

(or PREEMPT_RT, once i actually here of a patch being available, i hope soonish)

BFS is good enough for now though.

jordan

Re: 2.6.3x-rty where x > 3 and y >= 1?

[Niccolò Belli]

Il 11/11/2010 23:49, Ng Oon-Ee ha scritto:
>> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
>> with my intel video card and my band is starting to blame because of xruns.
>>
>> Darkbasic
> 
> In the meantime, the -bfs kernel does improve the situation somewhat.

I just compiled 2.6.36-bfs, but unfortunately alsa git does not compile
against it (I need alsa git because of M-Audio Fast Track Ultra support).

Darkbasic

Re: 2.6.3x-rty where x > 3 and y >= 1?

[Robin Gareus]

On 11/11/10 15:56, Niccolò Belli wrote:
> Il 10/11/2010 21:54, Thomas Gleixner ha scritto:
>> Working on it :)
> 
> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
> with my intel video card and my band is starting to blame because of xruns.
>
> Darkbasic

"Can't use it anymore" sounds weird. Is that related to some userspace
f.i. xorg update?

Did you try the 'i915.modeset=1' boot option with 2.6.33.7-rt29?

Said kernel works just fine here with both Intel and NVidia video cards
on debian/testing+sid.

best,
robin
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Re: 2.6.3x-rty where x > 3 and y >= 1?

[Robin Gareus]

On 11/19/10 22:18, Niccolò Belli wrote:
> Il 11/11/2010 23:49, Ng Oon-Ee ha scritto:
>>> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
>>> with my intel video card and my band is starting to blame because of xruns.
>>>
>>> Darkbasic
>>
>> In the meantime, the -bfs kernel does improve the situation somewhat.
> 
> I just compiled 2.6.36-bfs, but unfortunately alsa git does not compile
> against it (I need alsa git because of M-Audio Fast Track Ultra support).
> 
Don't worry. It's not worth the hype it generated. I'm just back from
rolling a new kernel for 64studio. I tried a couple of candidates
including -bfs.

2.6.33.7-rt29 is _by far_ the best option for low-latency audio.
Well, actually it's the only option (not counting older rt-linux
releases) which provides reliable <=4 ms latency (16 or 32 audio-frames
per period) without any x-runs!

Vanilla 2.6.36 and -bfs kernel both perform quite well. If >=15 ms
latency is sufficient for your use-case and you can live with some
occasional x-run that is.

I'm looking forward to a new -rt patch.

Cheers!
robin

PS. Note that sound latency here is not calculated (eg. 32*2/48kHz) but
measured with jack_delay from http://www.kokkinizita.net/linuxaudio/
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Re: 2.6.3x-rty where x > 3 and y >= 1?

[Niccolò Belli]

Il 25/11/2010 01:29, Robin Gareus ha scritto:
> On 11/11/10 15:56, Niccolò Belli wrote:
>> Glad to hear that, I can't use 2.6.33-rt anymore because of problems
>> with my intel video card and my band is starting to blame because of xruns.
> "Can't use it anymore" sounds weird. Is that related to some userspace
> f.i. xorg update?

It's because the Intel KMS driver sucks hard, *VERY* hard.

Because of this:
http://bugs.freedesktop.org/show_bug.cgi?id=27169

And this:
http://bugs.freedesktop.org/show_bug.cgi?id=30352

And this:
http://bugs.freedesktop.org/show_bug.cgi?id=26664

And this:
http://bugs.freedesktop.org/show_bug.cgi?id=27168

...and I can continue, but I think you get the point :-)

Intel driver is *SHIT*.

Darkbasic
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Re: 2.6.3x-rty where x > 3 and y >= 1?

[Niccolò Belli]

Il 25/11/2010 01:29, Robin Gareus ha scritto:
> Don't worry. It's not worth the hype it generated. I'm just back from
> rolling a new kernel for 64studio. I tried a couple of candidates
> including -bfs.
> 
> 2.6.33.7-rt29 is _by far_ the best option for low-latency audio.
> Well, actually it's the only option (not counting older rt-linux
> releases) which provides reliable <=4 ms latency (16 or 32 audio-frames
> per period) without any x-runs!

I agree: I patched alsa git to make it compile but I didn't notice any
major improvement with -bfs :-(

I hope the next -rt kernel will be released soon, otherwise I fear I
will crash my laptop next time I hear "what about buying a Mac?" .-.

Darkbasic