Bug 1730016 - enable ktimer_lockless_check for realtime-virtual-host/guest tuned profiles
Summary: enable ktimer_lockless_check for realtime-virtual-host/guest tuned profiles
Keywords:
Status: VERIFIED
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: tuned
Version: 7.8
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Jaroslav Škarvada
QA Contact: Robin Hack
URL:
Whiteboard:
Depends On:
Blocks: 1690543 1734096
TreeView+ depends on / blocked
 
Reported: 2019-07-15 15:14 UTC by Marcelo Tosatti
Modified: 2019-08-19 11:24 UTC (History)
6 users (show)

Fixed In Version: tuned-2.11.0-8.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1734096 (view as bug list)
Environment:
Last Closed:
Target Upstream Version:


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Github redhat-performance/tuned/commit/25089296f312281502dbb3689cb24eb24c48ffeb None None None 2020-02-26 21:18:24 UTC

Description Marcelo Tosatti 2019-07-15 15:14:36 UTC
RHEL-7.8 RT will include a feature to skip ktimersoftd wakeup. 

This feature is disabled by default and requires writing
1 to /sys/kernel/ktimer_lockless_check.

This should be enabled for tuned realtime profile.

Comment 2 Ondřej Lysoněk 2019-07-16 09:12:48 UTC
Do I understand it correctly that the sysfs file does not exist in the RHEL-7.7 realtime kernel, but is going to exist in the RHEL-7.8 RT kernel? What about RHEL-8? I'm just wondering whether we should put this change upstream or RHEL-7.8 only.

Comment 3 Marcelo Tosatti 2019-07-29 15:06:04 UTC
(In reply to Ondřej Lysoněk from comment #2)
> Do I understand it correctly that the sysfs file does not exist in the
> RHEL-7.7 realtime kernel, but is going to exist in the RHEL-7.8 RT kernel?
> What about RHEL-8? I'm just wondering whether we should put this change
> upstream or RHEL-7.8 only.

Its already upstream:

https://github.com/redhat-performance/tuned/commit/25089296f312281502dbb3689cb24eb24c48ffeb

So all is necessary is to backport it to RHEL-7.8 (and include it in RHEL-8 as well).

Comment 4 Ondřej Lysoněk 2019-07-29 15:31:32 UTC
Oh, ok.


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