Perhaps my question is not so-well posed. Let's turn it like this: How is the DSP load appearing in jack computed, and how does it have to deal with CPU/Memory/whateverphysicalthing load? Does jack generate an xrun as soon as it reaches 100% DSP load as a "security operation" or is it due to hardware limitation when reaching 100% DSP load? Thanks. On Thu, Oct 08, 2009 at 09:25:18AM +0200, Aurelien wrote : > Hello, > > I suppose this question has already been posted, and answered, but I > can't get any explanation which seems to fit my question, or I do not > understand it, so I post it there. > > I know that Jack DSP Load isn't a true DSP Load, it's nothing but > buffering, if I'm not wrong. > Though, I don't know what hardware part of the computer the DSP finally > relies to (or affects, or whatever), but I suppose it's the processor, > as the load of the DSP when launching, for example, one AMS seems to be > the same as the processor load assigned to the AMS process. > So, the first question is, does the DSP mean "processor load due to > software appearing in jack"? > > Next, question is about multicore. When I monitor my system using top on > a my quad-core or duo-core machines, I can reach total processor loads > such as 400% or 200%, as top seems to be designed for monocore. > Actually, it obviously means 4x100% or 2x100%. > When I use Jack1, I got an Xrun (at least) every time I reach the 100% > DSP load, which is finally with quite few softwares (4 AMS, 1 > Sooperlooper, 1 seq24, 1 Tapeutape, some routing, some qmidiroute) for > my configuration (Intel Q6600 Core 2 Quad, 8Gb RAM, Focusrite Saffire > Pro 40 soundcard -firewire, with developpment version of FFADO-). > What I was wondering is: does jack prefer to create an Xrun as soon as > 100% DSP load is reached? > > I just installed jack2, in order to check whether it might increase the > perf of my system, but, at first sight, the DSP load is the very same as > with jack1. > > OK, here it is, I'm sorry it's not really clearly explained, it's quite > clear in my head, but unfortunately, with french words!!! > > Thanks. > > -- > Aurélien > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > -- Aurélien _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
