Dell PowerEdge 1655MC - Manual (Page 19)

Optimal BIOS settings for HPC with Dell PowerEdge 12 th generation servers
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The Performance profile significantly improves MILC performance (21%), and energy efficiency is
within 8% of DAPC.
Section 7 concludes with BIOS recommendations that optimize for performance and for
performance/watt based on the test results in this section and those that follow in subsequent
sections.
5.3. Turbo Boost
It is well understood that Turbo Boost improves performance by increasing the processor core
frequency when there is available power and thermal headroom. This section quantifies exactly
how much performance improvement is gained by using Turbo Boost, and at the cost of how much
extra power for each application.
Figure 6. Performance and Energy Efficiency of Turbo Boost
* Data collected on a 16-server PowerEdge M620 cluster. Dual Intel Xeon E5-2680 @ 2.7GHz, 8*8GB 1600MT/s
memory per server. Mellanox InfiniBand FDR. Logical Processor and Node Interleaving disabled. For DAPC, Cstates
and C1E enabled like in the default System Profile. For Perf, C States and C1E disabled like in the default System
Profile.
Figure 6 presents the results of the study. For each application, the energy efficiency of Turbo
disabled is plotted relative to Turbo enabled. Recall from Section 4 that energy efficiency is
calculated as a ratio of Performance to Power consumed in Watts. In Figure 6 a bar higher than
1.00 indicates that the application’s energy efficiency was that much better with Turbo disabled.
From the behavior of Turbo Boost, it is expected that Turbo Boost disabled will reduce the
application’s performance compared to Turbo Boost enabled, but consume correspondingly less
power too. If the decrease in power consumption is more than the decrease in performance, the
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