all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Leo Famulari <leo@famulari.name>
To: guix-devel@gnu.org
Subject: Linux 6.12 new preemption models
Date: Wed, 1 Jan 2025 17:51:16 -0500	[thread overview]
Message-ID: <Z3XG5EcJurB8W8cG@jasmine.lan> (raw)

FYI, Linux / linux-libre 6.12 introduces a new set of preemption
options:

------
Preemption Model
  1. No Forced Preemption (Server) (PREEMPT_NONE)
> 2. Voluntary Kernel Preemption (Desktop) (PREEMPT_VOLUNTARY)
  3. Preemptible Kernel (Low-Latency Desktop) (PREEMPT)
  4. Fully Preemptible Kernel (Real-Time) (PREEMPT_RT) (NEW)
------

These options trade between kernel throughput and latency.

PREEMPT_NONE is how the kernels worked before 6.12. 

The trade-off made in PREEMPT_VOLUNTARY is suggested for desktops, so
I'm going to select it for our 6.12 kernel packaging and it will
presumably remain so for future versions as well.

But if you are building Guix kernels for a busy server or HPC, you
should select PREEMPT_NONE. And you might have use cases for the other
options as well.

Let me know if you disagree.

References:
https://cateee.net/lkddb/web-lkddb/PREEMPT_NONE.html
https://cateee.net/lkddb/web-lkddb/PREEMPT_VOLUNTARY.html
https://cateee.net/lkddb/web-lkddb/PREEMPT.html
https://cateee.net/lkddb/web-lkddb/PREEMPT_RT.html


             reply	other threads:[~2025-01-01 22:51 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-01 22:51 Leo Famulari [this message]
2025-01-03 18:15 ` Linux 6.12 new preemption models kiasoc5
2025-01-03 18:21   ` Leo Famulari

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Z3XG5EcJurB8W8cG@jasmine.lan \
    --to=leo@famulari.name \
    --cc=guix-devel@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.