Turbo boost, Node interleaving, Logical processor – Dell PowerEdge 1655MC User Manual

Page 30: Latency sensitive applications, Comparison to dell poweredge 11, Generation servers

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Optimal BIOS settings for HPC with Dell PowerEdge 12

generation servers

Turbo Boost

6) Turbo Boost disabled reduces application performance by up to 15% compared to Turbo Boost

enabled. But, at the same time, Turbo Boost disabled consumes 10% to 27% less power. This
translates in to 3% to 20% better energy efficiency with Turbo Boost disabled.

Reference Figure 6 - Performance and Energy Efficiency of Turbo Boost

Node Interleaving

7) Node Interleaving enabled hurts performance by up to 10% compared to this option set to disabled.

It does not benefit any application. Energy efficiency with Node Interleaving enabled is up to 9%
lower.

Reference Figure 7 - Performance and Energy Efficiency of Node Interleaving

Logical Processor

8) The impact of Logical Processor is application specific. Some applications benefit, and some do

not. For applications that have core-based licenses, it is likely that the cost of extra licenses will
significantly outweigh any performance benefits of Logical Processor enabled. For other
applications, it is recommended that this setting be tested to determine the best option.

Reference Figure 8 - Performance and Energy Efficiency of Logical Processor

C States and C1E on remote memory access

9) Disabling C States and C1E can help remote memory bandwidth by ~24% when compared to C States

and C1E enabled on systems where the remote cores are idle.

Reference Figure 9 - Impact of C States and C1E on remote memory access

Latency sensitive applications

10) Recommendations for latency sensitive applications are detailed in

this

study.

Comparison to Dell PowerEdge 11

generation servers

11) A 16-server 12