Exclusive CPU's throttled on low-latency profile

[Brent Rowsell]

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
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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

[Ghada Khalil (gkhalil)]

Marking as release gating; high priority impacts performance/latency

[Ghada Khalil (gkhalil)]

As per discussion with Brent, this appears to be a duplicate of https://bugs.launchpad.net/starlingx/+bug/1830297

[Ghada Khalil (gkhalil)]

Updating the release tag to stx.3.0 to match the duplicate bug

[Ghada Khalil (gkhalil)]

Moving as stx.4.0 to match the duplicate bug: https://bugs.launchpad.net/starlingx/+bug/1830297