Robin Gareus wrote: > Rui Nuno Capela wrote: >> Tim Goetze wrote: >>> [Tim Goetze] >>> >>>> [victor] >>>>> I was told to revert to 2.6.24.17 (not possible in my specific >>>>> case, but there you go), in this list. Or to join the tuner's list. >>>> http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.26.3-rt2.bz2 >>>> >>>> worked for me. Applied cleanly and compiled well after turning off >>>> some RCU-related preemption options that caused compilation errors, >>>> but I was in no mood to find out the exact how and why. So far, it >>>> has collected a few hours of solid uptime too, but I haven't done any >>>> latency measuring. >>> Update: on my laptop, the patched 2.6.26.3 kernel boots into an >>> endless list of tracebacks on the console. On the main box, USB MIDI >>> input is only read as soon as a key is pressed on the USB keyboard >>> (the one with the letters, not the MIDI one ...). USB MIDI out is >>> broken, too. So it's back to the old version. >>> >> ah, it seems i'm not alone. > > hehe , nice try. We won't let you go that easily ;) > >> i'm currently recovering myself from schock after returning from >> vacation and while trying 2.6.26.x-rt for the rentrýe it all seemed to >> work fine except omg... midi timing is a wreck, specially wrt.alsa >> sequencer. event delivery is completely fubar. i mean, completely. true >> showstopper, whatever :( > >> cacophony seems to be the right word to express what it is. > >> however, didn't had the time to check whether NOHZ is at stake. i'm >> certainly going back to 2.6.25.x-rt where things are still sane and >> pleasant for a while. > >> btw, having NOHZ=y (aka tickless kernel) has been the norm here, since >> its inception > > CONFIG_NO_HZ=y - same norm here; with good results iff it works. >
just tested 2.6.23.3-rt3 here with NO_HZ not set in my (old) pentium4 desktop. it just confirmed that NO_HZ is not the culprit here. midi events are still being delivered *completely* out of time and the funny thing is it just gets somewhat better whenever you hit the pc-keyboard keys. however, it all gets back to badness once you stop pressing any key (eg. shift-key) another funny thing goes that on a core2 duo T7200 laptop (x86_64) the same kernel config it runs all fine (NO_HZ=y) byee -- rncbc aka Rui Nuno Capela [EMAIL PROTECTED] _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
