Exclusive CPU's throttled on low-latency profile
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
StarlingX |
Triaged
|
High
|
Jim Gauld |
Bug Description
Brief Description
-----------------
I ran a busy loop on exclusive CPU's within a container. The threads should get 100% of the cpu. Instead I saw frequent throttling. This was on the low-latency profile. The standard profile does not exhibit this behavior
Disabling CFS quota's on the kubelet mitigated the issue.
Severity
--------
Major
Steps to Reproduce
------------------
Launch a pod with exclusive cpu and run a process in a busy loop within the container
Expected Behavior
------------------
Process gets 100% of the CPU
Actual Behavior
----------------
Process is being throttled
Reproducibility
---------------
100%
System Configuration
-------
Standard
Branch/Pull Time/Commit
-------
2019-05-22 17:57:16 -0400
Last Pass
---------
Don't know
Timestamp/Logs
--------------
There are no useful logs
Test Activity
-------------
Other
Changed in starlingx: | |
status: | New → Triaged |
importance: | Undecided → High |
assignee: | nobody → Jim Gauld (jgauld) |
Marking as release gating; high priority impacts performance/latency