On September 13, 2018 1:13:12 PM HST, Tim <termtech@xxxxxxxxxx> wrote: > > > On 09/13/2018 05:26 PM, Niklas Reppel wrote: > > Hi, > > > > i recently updated my Arch linux system, to to the following > version: > > > > Linux 4.18.6-arch1-1-ARCH #1 SMP PREEMPT > > > > Afterwards, i noticed that something has changed regarding the > realtime > > permissions > > and that i had to install a new package called > 'realtime-priviliges', > > which i never needed before, > > and subsequently add my main user to the 'realtime' group. > > > > In that wake, i updated the processor microcode, which i didn't use > at > > all before (there always was some > > error message during bootup, but nothing else). > > > > After being able to start JACK in realtime again, i felt that there > was > > a significant loss of performance. > > Things that didn't cause any dropouts before now start to crackle > and > > gristle (as a sidenote, i mostly > > use SuperCollider to make sound). > > > > Also, and this puzzled me especially, there were dropouts, but no > XRuns > > ... normally, when i push the > > system to the limits, i get XRuns, that'd be expected. But now, it's > > > dropouts without, and they start way > > earlier. > > > > My machine has an Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz Processor > if > > that info is of user for anyone ... > > > > Anybody else noticed something like that recently ? > > > > Best, > > nik > > > > Hello, I always reply when I hear of crackles, pops, and dropouts > because it took me several months to figure out my problem with that. > Maybe it will help. > > Here is the latest time I replied, a month ago, please scroll down: > > http://linux-audio.4202.n7.nabble.com/M-Audio-Fast-Track-Pro-unreliable-distorted-recording-td89125i20.html#a106829 > > Long story short: Try running with only one processor core active. > > It completely cured my problem, and another user's as well. > In my case the device is a PCI M-Audio delta1010, and in the > other user's case it was a similar ice1712-based card. > However in the above Fast-Track-Pro case, that's USB and we > don't yet know if the trick solved that user's problem... > > Be patient: If the number of CPU cores is the cause it may take > several minutes for the crackling to appear since I believe what > happens is that some low-level 'counters/pointers' which should > always be in sync slowly approach and 'pass' each other, and that's > when the noise occurs. > > In my case the very same symptom occurred in Windows. > That proved beyond doubt that it was a hardware issue. > > Hope that helps. > Tim. While I, on the other hand, use all cores (real and hyperthread) on my i7 with no crackles or distorted recordings and such at all. Same for the 4 real cores on my AMD desktop system. In my opinion, most PC motherboards weren't designed with any audio thought beyond including an on-board audio chip. -- David W. Jones gnome@xxxxxxxxxxxxx authenticity, honesty, community http://dancingtreefrog.com Sent from my Android device with F/LOSS K-9 Mail. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
