Information About Operation With Automation Runtime - B&R PC 3100 User Manual

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7.6.4.3 Information about operation with Automation Runtime

Information:
The specified thermal design power (TDP) of the CPU may be exceeded if the graphics load and CPU
utilization are high at the same time. In real-time applications, this can result in increased jitter and/
or higher cycle times.
If the TDP is exceeded, internal protection mechanisms of the CPU begin limiting the load to the limit of the TDP.
This means that either the CPU frequency or the graphic frequency (GPU) will be reduced/controlled. In real-time
applications, this can result in increased jitter and/or higher cycle times.
This behavior can be influenced by settings in BIOS. The maximum CPU frequency can be set in BIOS under
Advanced - CPU configuration using option CPU flex ratio override. The number of cores used can be set using
option Active processor cores.
In addition, the maximum frequency of the GPU (Gfx) can be limited in BIOS under Advanced - Power & Perfor-
mance - GT power management control with option Maximum GT frequency.
Limiting the CPU and/or GPU frequency reduces power consumption and prevents the TDP from being exceeded.
The optimal settings for real-time operation depend on several factors:
7.6.4.3.1 CPU variant used:
• If CPU C-3965U is used, no further action (BIOS settings) are necessary. However, B&R still recommends
using single-core operation for pure ARemb operation (Active processor cores limited to 1).
• If CPU i3-7100U, i5-7300U or i7-7600U is used, see "ARemb, ARwin or B&R Hypervisor mode".
7.6.4.3.2 ARemb , ARwin or B&R Hypervisor mode:
• For pure ARemb operation, single-core operation (Active processor cores = 1) must be used and the GPU
frequency limited to an average value, see "Typical use cases for ARemb".
• For ARwin or B&R Hypervisor mode, see "Typical use cases for ARwin orB&R Hypervisor".
7.6.4.3.3 Typical use cases for ARemb:
The following configuration examples are intended to represent typical use cases.
xPC3100 C-3965U
xPC3100 i3-7100U
xPC3100 i5-7300U
xPC3100 i7-7600U
7.6.4.3.4 Typical use cases for ARwin or B&R Hypervisor:
The following configuration examples are intended to represent typical use cases.
xPC3100 C-3965U
xPC3100 i3-7100U
xPC3100 i5-7300U
xPC3100 i7-7600U
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No limitation of CPU and/or GPU frequency necessary.
Operation with max. CPU and Gfx frequency is possible.
However, B&R recommends single-core operation (Active processor cores = 1).
Single-core operation with 2400 MHz CPU frequency and 600 MHz Gfx frequency
Single-core operation with 2600 MHz CPU frequency and 600 MHz Gfx frequency
Single-core operation with 2800 MHz CPU frequency and 600 MHz Gfx frequency
No limitation of CPU and/or GPU frequency necessary.
Operation with max. CPU and Gfx frequency is possible.
Single-core operation with 1400 MHz CPU frequency and 800 MHz Gfx frequency
Single-core operation with 2000 MHz CPU frequency and 450 MHz Gfx frequency
Single-core operation with 1600 MHz CPU frequency and 800 MHz Gfx frequency
Single-core operation with 2100 MHz CPU frequency and 450 MHz Gfx frequency
Single-core operation with 1600 MHz CPU frequency and 800 MHz Gfx frequency
Single-core operation with 2100 MHz CPU frequency and 450 MHz Gfx frequency
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