linuxaudio.org

On Fri, Jan 07, 2011 at 08:05:59AM -0600, Gabriel M. Beddingfield wrote:

quoted text
>

>

> On Fri, 7 Jan 2011, torbenh wrote:

>

> >On Sun, Dec 12, 2010 at 07:22:28PM +0100, Jeremy Jongepier wrote:

> >>On 12/12/2010 06:42 PM, Ronald Stewart wrote:

> >>>Hi,

> >>>

> >>>I would go with what Robin said.  That being said, Robin's tweaks on

> >>>Transmission last year on 89 set the pace for our build (brilliant!).  Since

> >>>then tuning jack2 (jackdmp) Rui's rtirq, plus tuning for specific chips /

> >>>computer hardware makes a difference.  If you want something now that truly

> >>>stands up and has had some of the best Linux developers touch the project,

> >>>go with Transmission 4.2.  I know Paul will jump in and tune us all up with

> >>>our thoughts (go Paul!) but it should be stated again we are getting lights

> >>>out performance without RT on our new multi-touch Tablets for Pro Audio with

> >>>2.6.35, Meego/AtomN450.

> >>

> >>So with 2.6.35 rtirq also works with a non real-time kernel?

> >

> >i am not aware of normal kernels having threaded irq handlers.

> >additionally jack2 does not mlockall clients.

>

> Indamixx/Transmission 4 has a PREEMPT_RT kernel and utilizes rtirq.

>

> Indamixx 2/Transmission 5 (MeeGo) has a PREEMPT kernel, and

> therefore rtirq won't work with it.  We've spent a lot of time

> tuning this kernel, and while there have been no clinical tests...

> we're experiencing performance very close to Transmission 4's

> PREEMPT_RT kernel (With jack running at 512x2 frames/buffer and

> 44100 Hz) on various machines.

ahh... 512 is pretty high latency, normal PREEMPT kernels should do that

pretty well. 
>

quoted text
> We are required by MeeGo to have a kernel >= 2.6.35.  In addition,

> to use 2.6.33 we would have to backport a boat-load of device

> drivers.  If an PREEMPT_RT patch appears for 2.6.35 or 2.6.37, you

> can bet that we'll be all over it and doing side-by-side

> comparisons.

>

> -gabriel

--

torben Hohn

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