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 | ||
| 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:
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# tuned-adm profile throughput-performance optimize-serial-console
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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:
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# cat /proc/sys/kernel/printk
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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: | |||
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Comment 2
Jaroslav Škarvada
2020-05-28 14:07:31 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 |