Re: [LAU] Realtime latency kernel testing

On Fri, 7 Jan 2011, torbenh wrote:

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

I knew _someone_ would chime in about 23ms being "high
latency." :-)

FWIW, several popular apps (esp. those doing Fourier
Transforms, like time-stretchers) will not work reliably at
<256 frames/period.

-gabriel

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Received on Sat Jan 8 00:15:09 2011