On Thu, 03 Oct 2019 02:41:50 +0000, er...@ericheickmeyer.com wrote: >The reason it's slower than the generic kernel is that the lowlatency >kernel prioritizes AUDIO, nothing else.
Hi, this is completely irrelevant, if the OP suffers from a regression after an upgrade. It has got impact, but in a moment when audio isn't used, it not necessarily is the cause for bad performance. The combination of the "lowlatency" kernel settings for example in combination with e.g. meltdown/spectre mitigations and audit enabled, could make a difference depending on the kernel version and used hardware. In short, a lot of factors could affect performance. Troubleshooting by changing rt priorities, disabling mitigations and audit and a lot of other things, I can't mention all of them, might lead to some kernel config setting that maybe lead to a thread handling related regression in the kernel or even to an issue related to a shared dependency required by LibreOffice and other software. For other reasons, manly a regression related to GTK2 apps, I stay with [weremouse@moonstudio ~]$ lsb_release -a LSB Version: core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch Distributor ID: Ubuntu Description: Ubuntu 16.04.6 LTS Release: 16.04 Codename: xenial Ubuntu flavours > 16.04, as well as my "main" Linux (Arch Linux) suffer from crashing GTK2 GUIs (not from performance issues). Resume: As soon as "threadirqs" is involved (for the "lowlatency" kernel it is) even the priorities "feature", could suffer from a regression and cause issues. If there is no noticeable performance issue for the OP when using 16.04 with the lowlatency kernel, while for other releases there is such an issue, _it is_ a regression, even if the generic kernel for 16.04 would allow better performance, than the lowlatency kernel for 16.04, too. The key is, that a machine configured for a special purpose slowed down after an upgrade and now can't be used anymore, since the performance isn't good enough anymore. Assuming the hardware didn't break, then a software related regression is the reason. >The generic kernel exists for general purpose, the lowlatency kernel, >while it works for general use, is definitely configured to prioritize >lowlatency audio. But the OP could use the lowlatency kernel of 16.04 for "general purpose" when using 16.04 and can't continue doing it with newer releases, so something changed, that shouldn't change. Only this is relevant. Regards, Ralf -- ubuntu-studio-devel mailing list ubuntu-studio-devel@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-devel
