On Wed 07 Jul 2021 at 09:35:17 (-0400), Polyna-Maude Racicot-Summerside wrote: > On 2021-07-07 7:59 a.m., Dan Ritter wrote: > > w f wrote: > >> I locally host and maintain some Minecraft (Java) servers for my kids and > >> their friends. This morning, I kicked everyone off the servers while I did > >> some routine maintenance. I finished with a standard sudo apt update && > >> sudo apt full-upgrade > >> A few things were updated - PHP, a library or two, and the kernel from > >> 4.19.0-16-amd64 to 4.19.0-17-amd64 > >> All went fine. > >> After I was done, I rebooted the system and fired up the MC servers. As > >> soon as a player joins an MC server, the CPU usage on all cores slams to > >> 100% and stays there. The game is unplayable. > >> Nothing has changed with regards to the versions of game server, game > >> clients, or Java. > >> Debian buster.Oracle Java 16.0.1 > >> Is there any way to downgrade back to 4.19.0-16-amd64 ... ?
No need. > Yes you can downgrand > apt-get downlaod linux-image-4.19.0-16-amd64 > dpkg -i linux-image-4.19.0.16-amd64.deb > > > Probably, but I can attest that > > > > openjdk-11-jre-headless > > > > runs Minecraft servers perfectly well with that kernel, so > > perhaps switching Java runtimes is a less drastic choice. > > > I'd go with using openjdk-11-jre-headless > As it's not a solution to downgrade the kernel, what do you do after > this ? Stay with this kernel and hope it will be fixed for the next > update (not knowing what's causing the issue)... While taking no view on the cause of the problem, I would recommend that you eliminate a kernel problem by running version 16 of the kernel. You should barely need to lift a finger to achieve this, because version 16 should (a) still be installed, and (b) be listed in the Grub menu under "Advanced options". Cheers, David.
