Kernel 6.8.0-20-generic - lowlatency and generic merge into one

[1fallen]

Since the beginning of testing Noble, Ive always had a choice between the two.
EDIT Let me clean that up first.

apt list --installed | grep linux-image

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

linux-image-6.8.0-28-generic/noble,now 6.8.0-28.28 amd64 [installed,automatic]
linux-image-6.8.0-28-lowlatency/noble,now 6.8.0-28.28.1 amd64 [installed]
linux-image-generic/noble,now 6.8.0-28.28 amd64 [installed,automatic]

On my end Doug I've always seen both.

uname -r
6.8.0-28-lowlatency

[corradoventu]

On my Ubuntu noble installed from today ISO I see

corrado@corrado-n7-nn-0420:~$ uname -r
6.8.0-28-generic
corrado@corrado-n7-nn-0420:~$ apt list --installed | grep linux-image

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

linux-image-6.8.0-28-generic/noble,now 6.8.0-28.28 amd64 [installed,automatic]
linux-image-generic-hwe-24.04/noble,now 6.8.0-28.28 amd64 [installed,automatic]
corrado@corrado-n7-nn-0420:~$

[1fallen]

Humm, dose it show here:

apt list  | grep linux-image-lowlatency

I did install the lowlat kernel myself.

[Doug S]

Thanks for the replies. I had thought there was not a lowlatency version of kernels since 6.8.0.20, at the start of this thread. But I just did updates and got both 6.8.0-28-generic and 6.8.0-28-lowlatency.

doug@s19:~/kernel/linux$ dpkg -l | grep linux-image-6.8.0
rc  linux-image-6.8.0-11-generic                 6.8.0-11.11                             amd64        Signed kernel image generic
ii  linux-image-6.8.0-20-generic                 6.8.0-20.20                             amd64        Signed kernel image generic
ii  linux-image-6.8.0-22-generic                 6.8.0-22.22                             amd64        Signed kernel image generic
ii  linux-image-6.8.0-28-generic                 6.8.0-28.28                             amd64        Signed kernel image generic
ii  linux-image-6.8.0-28-lowlatency              6.8.0-28.28.1                           amd64        Signed kernel image lowlatency
ii  linux-image-6.8.0-7-lowlatency               6.8.0-7.7.1                             amd64        Signed kernel image lowlatency

However, I did install the linux-lowlatency package at some point, and not sure exactly when I did it, or even why (I thought is was way back so I could get 6.8.0-7-lowlatency):

sudo apt install linux-lowlatency

EDIT: I think this is my mistake, I found a comment on the related discourse page that says their is no plan to deprecate the lowlatency kernel for 24.04

EDIT: But there is also this, from the bug report, which suggests the objective is only one kernel, and which also makes a lot of sense:

Maintaining a separate kernel for a single config option seems a bit overkill and it is a significant
cost of engineering hours, build time, regression testing time and resources. Not to mention the risk of
the low-latency kernel falling behind and not being perfectly in sync with the latest generic kernel.