On Fri, 25 Jul 2014 06:27:54 -0700 (PDT) Len Ovens <len@xxxxxxxxxxxxx> wrote: > Running ubuntustudio 14.04 here. jackdbus is set 2/32 and I turned > pulse->jack bridging on. qjackctl shows DSP at 6-12%, Gnome system > monitor shows all cores at around 4%, Top shows pulse at 11%, the > sound card at 6%, jack at 3.5%, a2jmidid at 2%.... turning pulse off > has top showing the sound card at 8%, jack at 6% and a2j at 2%, but > jack DSP is 3.5%. All of which brings into question the tools we use > for measuring this stuff and what those numbers really mean. > > Setting my system to desktop mode (2048 frames, pulse on) gives jack > dsp of .88% (or less) and makes them harder to follow in top because > they are now at least fifth down and all less than 1%. You are comparing apples and oranges :) Most of those measurements are cpu use, qjackctl's dsp load is a measure of latency (execution time). That is to say there is a deadline given by the sample rate divided by the buffer size. If DSP load is 50%, the audio processing has used up half of the time available. If 100% it has used up all the time. Note that there is overhead involved, the conventional wisdom is to not go over 50%, but ymmw.. -- Joakim _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
