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This saves power consumption of the overall socket or allows power to be diverted to other portions of the processor. Like processor cores, the EPYC SOC can go into lower power states (P-states) when being lightly used. To enable x2APIC (Default XAPIC MSI Interrupts), set the following on the BIOS:Īdvanced → AMD CBS → CPU Common Options → Local APIC Mode → x2APIC (The AMD BIOS will enable x2APIC automatically when two 64-core processors are installed.) It provides improved performance over the legacy APIC.ĪMD recommends, but does not require, that you enable the x2APIC mode in BIOS, even for lower core count parts.
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It allows the operating systems to work with the 256 CPU threads. To set performance mode on the BIOS, set the following on the BIOS:Īdvanced → AMD CBS → NBIO Common Options → SMU Common Options → Determinism Control → ManualĪdvanced → AMD CBS → NBIO Common Options → SMU Common Options → Determinism Slider → Performance x2APIC MSI InterruptsĪMD has implemented an x2APIC controller. Note: This can be configured to only one PCIe function per system. To enable preferred IO (improving PCIe ordering performance), do the following on the BIOS:Īdvanced → AMD CBS → NBIO Common Options → Preferred IO → ManualĪdvanced → AMD CBS → NBIO Common Options → Preferred IO Bus → HCA and GPU or multiple HCAs), this option should be tested since the other PCI device may suffer due to preferred scheduling. In case there is more than one PCI device (e.g. This will help reduce the scheduling overhead between the CPU and the PCI components, while giving the adapter better performance. one HCA), it is recommended to set the preferred IO to that PCI slot. In case there is only one PCI device on the host (e.g. There is an option to set a specific PCI slot as preferred (scheduling). Note: This configuration is important to achieve the max 200Gb/s performance. To enable NPS2 (allocate memory locally to NUMA node where NIC resides), set the following on the BIOS:Īdvanced → AMD CBS → DF Common Options → Memory Addressing → NUMA nodes per socket → NPS2
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However, specific applications might need more testing to tune the specific performance.įor 100Gb/s any NPS configuration will work.
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We recommend checking with the OEM system vendor, for best NPS configuration on the specific system you own.įor maximum bandwidth of micro-benchmarks tests over InfiniBand HDR (or 200Gb/s) gen4 PCI with EPYC Series 7002 processors, using NPS=1 or NPS=2 is recommended due to the number of memory channels (more memory channels = more bandwidth).įor maximum bandwidth micro-benchmarks tests over InfiniBand HDR100 or EDR with 2 nd Gen EPYC, any configuration will work to reach line rate.įor HPC application testing, NPS=2 or NPS=4 recommendation may depend on the application's ability to reach better locality between the CPUs and the memory.