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Bug 1840689

Summary:	New profile: optimize-serial-console
Product:	Red Hat Enterprise Linux 8	Reporter:	Karl Abbott <kabbott>
Component:	tuned	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED ERRATA	QA Contact:	Robin Hack <rhack>
Severity:	unspecified	Docs Contact:	Jaroslav Klech <jklech>
Priority:	unspecified
Version:	8.2	CC:	chorn, jeder, jklech, jskarvad, rhack
Target Milestone:	rc	Keywords:	Patch, Triaged, Upstream
Target Release:	8.0	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	tuned-2.14.0-0.1.rc1.el8	Doc Type:	Enhancement
Doc Text:	.A new `optimize-serial-console` TuneD profile to reduce I/O to serial consoles by lowering the `printk` value With this update, a new `optimize-serial-console` TuneD profile is available. In some scenarios, kernel drivers can send large amounts of I/O operations to the serial console. Such behavior can cause temporary unresponsiveness while the I/O is written to the serial console. The `optimize-serial-console` profile reduces this I/O by lowering the `printk` value from the default of 7 4 1 7 to 4 4 1 7. Users with a serial console who wish to make this change on their system can instrument their system as follows: ---- # tuned-adm profile throughput-performance optimize-serial-console ---- As a result, users will have a lower `printk` value that persists across a reboot, which reduces the likelihood of system hangs. This TuneD profile reduces the amount of I/O written to the serial console by removing debugging information. If you need to collect this debugging information, you should ensure this profile is not enabled and that your `printk` value is set to 7 4 1 7. To check the value of `printk` run: ---- # cat /proc/sys/kernel/printk ----	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:03:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Comment 2 Jaroslav Škarvada 2020-05-28 14:07:31 UTC

Upstream PR:
https://github.com/redhat-performance/tuned/pull/273

Comment 17 errata-xmlrpc 2020-11-04 02:03:08 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (tuned bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4559