[11:37] <Guest4> hey, since the answer to my question in #ubuntu are more of a rant, I'm cross-posting here to a more specialised channel. Ubuntu offers a low-latency kernel, but I have trouble finding out how this differs from the normal kernel. I found this kernel config:
[11:37] <Guest4> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-lowlatency/+git/focal/tree/debian.master/config/amd64/config.flavour.lowlatency . Are these the only changes for the low-latency kernel? I know that upstream linux has an RT patch. Does the low-latency kernel also patch some functions?
[11:42] <Guest4> in general, I'm having a bit of trouble understanding where the kernel code is located and how they're build. There's the `index : ~ubuntu-kernel/ubuntu/+source/linux-lowlatency/+git/focal` repo which I assume holds the lowlatency kernel, but the kernel in `~ubuntu-kernel/ubuntu/+source/linux/+git/focal` says in the `Ubuntu.md` that: `produce the
[11:42] <Guest4> flavours: generic, generic-lpae, lowlatency.`How do they differ? I checked-out both for the same version (tag) and there's barely any difference according to `diff`
[12:59] <thibf> Guest4: so the kernel you looked into is the focal one, based on 5.4 linux kernel. You can find all kernel trees that we maintain  listed here : https://kernel.ubuntu.com/git/
[13:02] <thibf> Guest4: We also maintain kernels including the RT patchset, but they are only available for those on Ubuntu Pro
[13:06] <thibf> Guest4: For lowlatency, it's only a kernel config change. Maybe these blog posts can help you to get a better understanding of what we do here : 
[13:06] <thibf> https://discourse.ubuntu.com/t/enable-low-latency-features-in-the-generic-ubuntu-kernel-for-24-04/42255
[13:06] <thibf> https://discourse.ubuntu.com/t/fine-tuning-the-ubuntu-24-04-kernel-for-low-latency-throughput-and-power-efficiency/44834
[13:58] <Guest27> thank you, that was helpful