===================================
#opnfv-meeting: weekly tech discuss
===================================


Meeting started by efoley at 13:05:06 UTC.  The full logs are available
at
http://ircbot.wl.linuxfoundation.org/meetings/opnfv-meeting/2020/weekly_tech_discuss/opnfv-meeting-weekly_tech_discuss.2020-10-12-13.05.log.html
.



Meeting summary
---------------

* Performance Tuning through optimal bios settings  (efoley, 13:07:12)
  * iLO provides additional metrics that give information about the
    workloads, which may differ from the corresponding metrics given by
    the operating system  (efoley, 13:11:11)
  * This gives enhanced capabilities for workload matching between
    system capabilities and workload requirements  (efoley, 13:12:05)
  * There are multiple workload profiles available, and will tune the
    system to optimise for e.g. latency, throughput, maximum frequency,
    etc  (efoley, 13:14:57)
  * Custom workload profiles can also be defined for user that want to
    set specific BIOS config options  (efoley, 13:16:26)
  * Opportunistic CPU frequency shifting can introduce latency and
    non-determinism to the workloads, this can be problematic for
    workloads that are latency sensitive and rely on deterministic
    performance. These delays can destroy the benefit of the increased
    performance.  (efoley, 13:21:01)
  * There are different features that provide opportunistic performance
    boosts and power savings, by modifying the processor frequency
    (p-states and power management, turbo boost, C-states, power and
    thermal events, Advanced Vector Extensons), these all provide
    sources of jitter (and latency) in the system.  (efoley, 13:29:00)
  * Changes to CPU frequency requires stopping the core for a short
    time, typically 10-15us.  (efoley, 13:30:05)
  * In some instances, using the intel_idle driver means that the
    C-state reporting and API options are ignored. This driver needs to
    be disabled for optimal jitter reduction  (efoley, 13:35:00)
  * Processor jitter control can be used to improve performance for
    workloads that are traditionally sensitive to latency  (efoley,
    13:37:07)
  * Processor jitter control sets a base frequency, and causes frequency
    changes to below this to be ignored  (efoley, 13:40:12)
  * Using processor jitter control, a higher performance can be seen
    with a lower CPU frequency (pres has graphs available)  (efoley,
    13:45:04)
  * odim.io (Open Distributed Infrastricture Management) is an
    initiative to collaborate with multiple vendors.  (efoley, 13:59:02)



Meeting ended at 14:00:50 UTC.



People present (lines said)
---------------------------

* efoley (15)
* collab-meetbot (3)



Generated by `MeetBot`_ 0.1.4