All of lore.kernel.org
 help / color / mirror / Atom feed
From: Andreas Hollmann <hollmann@in.tum.de>
To: linux-numa <linux-numa@vger.kernel.org>
Subject: Is it possible to disable numa_balance after boot?
Date: Sat, 4 Jan 2014 18:46:55 +0100	[thread overview]
Message-ID: <CAGz0_-2mkN=KCp=3WkPPVo2_JAtNJAkVpBcwfQ4LVr8R40P=tQ@mail.gmail.com> (raw)

Hi,

is possible to turn of numa balancing (introduced in 3.8) in a running kernel?

I'm running a recent arch kernel and numa balancing is enabled by
default. I checked
several documents and found some sysctl variable which influence the behavior of
numa balance, but there is no clear documentation if it's possible to
disable it.

The only defined way to disable it is using a kernel parameter

numa_balancing= [KNL,X86] Enable or disable automatic NUMA balancing.
Allowed values are enable and disable

Is there any other way?

Best regards,
Andreas


$ uname -a
Linux inwest 3.12.6-1-ARCH #1 SMP PREEMPT Fri Dec 20 19:39:00 CET 2013
x86_64 GNU/Linux

$ cat /usr/src/linux-3.12.6-1-ARCH/.config | grep NUMA_BALANCING
CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y
CONFIG_NUMA_BALANCING=y

$ ls -l /proc/sys/kernel | grep numa_bal
-rw-r--r-- 1 root root 0 Jan  4 14:23 numa_balancing_scan_delay_ms
-rw-r--r-- 1 root root 0 Jan  4 14:23 numa_balancing_scan_period_max_ms
-rw-r--r-- 1 root root 0 Jan  4 14:23 numa_balancing_scan_period_min_ms
-rw-r--r-- 1 root root 0 Jan  4 14:23 numa_balancing_scan_period_reset
-rw-r--r-- 1 root root 0 Jan  4 14:23 numa_balancing_scan_size_mb

             reply	other threads:[~2014-01-04 17:46 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-04 17:46 Andreas Hollmann [this message]
2014-01-04 18:22 ` Is it possible to disable numa_balance after boot? Andi Kleen
2014-01-04 18:22   ` Andi Kleen
2014-01-04 21:37   ` Andreas Hollmann
2014-01-06 20:33   ` Andrew Morton
2014-01-06 20:33     ` Andrew Morton

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='CAGz0_-2mkN=KCp=3WkPPVo2_JAtNJAkVpBcwfQ4LVr8R40P=tQ@mail.gmail.com' \
    --to=hollmann@in.tum.de \
    --cc=linux-numa@vger.kernel.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. 
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.