Re: Realtime latency kernel testing

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

> 
> 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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