[LAD] tschack ... early version of smp enabled jack1

[Stéphane Letz]

Le 27 janv. 2010 à 21:02, Jörn Nettingsmeier a écrit :

> On 01/27/2010 08:39 PM, alex stone wrote:
> 
>> It's been a good day, and i've enjoyed the stability. I used jack1
>> before, because it gave me fewer challenges, xruns and occasional pops
>> and spits, than jack2, which i ended up having to ease out to
>> 48000/512/3, to reach near the same performance. (i'm on 48000/256/3
>> with jack1)
> 
> for some more anecdotal evidence, this is about what i was seeing during 
> my jack1/2 comparison tests. jack2 generally required one buffer size 
> step more to achieve the same xrun robustness as jack1. but i'm 
> generally able to use much lower latencies down to 64 (or 128 in the 
> jack2 case), unless i use jconvolver, which forces me to go to at least 
> 1024 so as not to max out the cpu.
> 
> i didn't think too much about jack2's apparent overhead, since it has 
> the benefit of scaling to smp, which usually affects the 
> single-processor case (my box is a single-core amd64).
> it would be interesting to see if torben's approach is able to deliver 
> the same latencies as jack1, while adding smp support.
> 
> regards,
> 
> jörn

Well "jack2's apparent overhead," is something new for me, and would require some deeper test/feedback to understand better. Moreover without more precise description of xruns occurrence (at what DSP CPU does it start to happen.. etc..) , what kind of setup (jack2 version, jack configuration, applications used....), it is again hard to understand/correct things.

Stéphane