Stromeko at nexgo.de
Sat Apr 13 16:28:19 UTC 2019
Udo van den Heuvel via devel writes:
> On 13-04-19 15:29, Achim Gratz via devel wrote:
>> Udo van den Heuvel via devel writes:
>>> Fedora 29, kernel.org 4.19.30. (my compile)
>> Is this a "tickless" kernel perhaps? If so, try "nohz=off" on the
>> kernel command line in the boot manager and see if that helps.
> # grep HZ .config|grep -v ^#
> tickless does not go with PPS support...
How about you boot with "nohz=off"?
> My kernel is from kernel.org and compiled by me.
What keeps you from using a newer one, then?
> I need faster memory for later BIOS. Perhaps later this year.
That's the first time I ever hear about a BIOS update requiring a higher
memory speed (earlier BIOS versions not supporting _hugher_ memory
speeds, yes -- but not the other way around).
> What /was/ the problem in that case?
The same that you still see: the system clock gets stopped and two
consecutive reads of the clock read the same (or maybe time even goes
backwards when looked at with higher resolution).
> With tsc there was no real sync to pps.
> With hpet we do have sync to pps.
The only thing switching to HPET does is reducing clock resolution _a
lot_, so if your clock is funky with TSC, it still is with HPET. It has
more chance of averaging out over the longer interval between clock
ticks, that's all.
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
SD adaptation for Waldorf rackAttack V1.04R1:
More information about the devel