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Bug 1505158

Summary: RFE: Improve RT throttling mechanism [rhel-7.4.z]
Product: Red Hat Enterprise Linux 7 Reporter: Oneata Mircea Teodor <toneata>
Component: kernel-rtAssignee: Clark Williams <williams>
kernel-rt sub component: Memory Management QA Contact: Jiri Kastner <jkastner>
Status: CLOSED ERRATA Docs Contact:
Severity: medium    
Priority: high CC: bhu, cww, daolivei, dhoward, kernel-eus-qe, mkolaja, salmy, stalexan, toneata, williams
Version: 7.4Keywords: FutureFeature, ZStream
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: kernel-rt-3.10.0-693.11.1.rt56.629.el7 Doc Type: Enhancement
Doc Text:
The current realtime throttling mechanism prevents the starvation of non-realtime tasks by CPU-intensive realtime tasks. When a realtime run queue is throttled, it allows non-realtime tasks to run. If there are not non-realtime tasks, the CPU goes idle. To safely maximize CPU usage by decreasing the CPU idle time, the RT_RUNTIME_GREED scheduler feature has been implemented. When enabled, this feature checks if non-realtime tasks are starving before throttling the realtime task. The RT_RUNTIME_GREED scheduler option guarantees some run time on all CPUs for the non-realtime tasks, while keeping the realtime tasks running as much as possible.
 Story Points: ---
Clone Of: 1401061 Environment:
Last Closed: 2017-11-30 16:03:50 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1401061    
Bug Blocks:    

Description Oneata Mircea Teodor 2017-10-22 16:07:13 UTC 
This bug has been copied from bug #1401061 and has been proposed to be backported to 7.4 z-stream (EUS).
Comment 9 errata-xmlrpc 2017-11-30 16:03:50 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, 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/RHSA-2017:3322