Thank you, for the xanmod kernel patch.

[marioroy]

Aloha,

I wish for a low-latency kernel. Who doesn't want that? So, I tried various kernels. The one that stands out is the xanmod kernel with some customization applied.

Low latency results were captured on Fedora 38.
https://pastebin.com/zF7EyJXu

My custom (tinkered spec) kernel-xanmod lives in gist.
https://gist.github.com/marioroy/263bb5946da8ea63e0d35f9d6912b97c

Please, do tell me if you dislike the customization. I've been running this for several weeks under varied work loads. Perhaps, I do not need to change the tick rate. The reason is that my CPU fan runs louder with HZ_500 for some reason (similar work loads). I have sensitive hearing and noticed it immediately running the xanmod kernel as is. I misplaced the URL where I received the inspiration to change the tick rate to 1000 for the xanmod kernel. Maybe, I need to revisit the 500 HZ again.

I documented in the spec file where I received the inspiration for the customization. Keeping RCU_LAZY disabled resulted in better performance for me. CachyOS has it enabled.

1. Disable DEBUG
2. Change tick rate to 1000
3. Enable full tickless mode
4. Apply RCU options as in CachyOS; disable RCU_LAZY
5. Enable full preempt as in CachyOS

Blessings and grace,
Mario

[marioroy]

I tried HZ_500 again and left it at default; e.g. disabled change to HZ_1000 in spec file.

$ grep HZ_500 /boot/config*
/boot/config-6.1.27-xm1.0.fc38.x86_64:CONFIG_HZ_500=y
/boot/config-6.3.1-xm1.0.fc38.x86_64:CONFIG_HZ_500=y

Again, thank you for the xanmod kernel patch.