[LAU] performance problems after kernel/microcode update ?

Niklas Reppel nik at parkellipsen.de
Thu Sep 13 23:26:30 CEST 2018


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 
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

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 ?


Niklas Reppel

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