Troubleshooting
Problem
The Intel Haswell-EP Processor will not enter Package C-State C6 when idle. This results in higher idle power consumption than necessary. Load power consumption is unaffected.
Resolving The Problem
Source
RETAIN tip: H214183
Symptom
The Intel Haswell-EP Processor does not enter Package C-State C6 when idle. This results in higher idle power consumption than necessary. Load power consumption is unaffected.
Affected configurations
The system can be any of the following Lenovo servers:
- Flex System x240 M5 Compute Node, type 9532, any model
This tip is not software specific.
This tip is not option specific.
Workaround
No workaround.
Additional information
Enabling hotplug on the Intel Haswell-EP platform causes Package C-State C6 to become unavailable, because hotplug requires the Peripheral Component Interconnect express (PCIe) to remain active.
Lenovo enables PCIe hotplug so that Non-Volatile Memory express (NVMe) drives can be hotplugged into the system. NVMe drives can be installed only if the NVMe backplane is installed in the system.
This issue will be addressed in the next firmware revision. Lenovo will disable hotplug should the NVMe backplane not be installed in the system. If the NVMe backplane is installed in the system, the loss of Package C-State C6 is an Intel hardware limitation that cannot be circumvented.
Document Location
Worldwide
Applicable countries and regions
- Worldwide
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Document Information
More support for:
Lenovo x86 servers->Lenovo x240 M5 Compute Node->9532
Document number:
866432
Modified date:
30 January 2019
UID
ibm1MIGR-5097464