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Bug 1058098 - disable numa balancing for latency performance profile
Summary: disable numa balancing for latency performance profile
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: tuned
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Jaroslav Škarvada
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-01-27 02:10 UTC by Rik van Riel
Modified: 2017-02-27 12:09 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-02-12 18:29:39 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)

Description Rik van Riel 2014-01-27 02:10:32 UTC
Description of problem:

The latency performance profile already disables transparent huge pagees, in order to avoid the latency associated with moving memory around into and out of huge pages.

It should also disable the numa balancing code, which relies on numa hinting page faults to figure out where a task should run, and where a task's memory should be migrated to. This can introduce undesired latency.

NUMA balancing can be disabled with the following command:

# echo NO_NUMA > /sys/kernel/debug/sched_features

Comment 5 Joe Mario 2016-05-16 11:06:38 UTC
Housekeeping update.  
Even though this BZ was closed over two years ago, I'm still on it marked as "need info".  I'm clearing that flag to stop the reminder need-info emails.

Comment 6 Joe Mario 2017-02-27 12:09:10 UTC
Housekeeping update.  
Even though this BZ was closed over three years ago, I'm still on it marked as "need info".  I'm clearing that flag to stop the reminder need-info emails.


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