Unable to pin Intel(R) Xeon(R) Gold 6248 CPU @ 2.50GHz to 2.5GHz when running the FlexRAN L1

[Amurg]

Hello,

I have the following setup:

- Server type: Dell POWEREDGE R640;
- CPU: Intel(R) Xeon(R) Gold 6248 CPU @ 2.50GHz;

- OS: Ubuntu 22.04 with 5.15.0-1087-realtime kernel version;

CPU settings:
cat /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq

1601000

cat /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_max_freq

1601000
cat /sys/devices/system/cpu/cpu2/cpufreq/scaling_driver

acpi-cpufreq

(base) root@cg-node1:/etc# cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-5.15.0-1087-realtime root=/dev/mapper/vgubuntu-root ro intel_iommu=on iommu=pt vfio_pci.enable_sriov=1 vfio_pci.disable_idle_d3=1 usbcore.autosuspend=-1 selinux=0 enforcing=0 nmi_watchdog=0 crashkernel=auto softlockup_panic=0 audit=0 cgroup_disable=memory mce=off hugepagesz=1G hugepages=60 hugepagesz=2M hugepages=0 default_hugepagesz=1G kthread_cpus=0,1,40,41 irqaffinity=0,1,40,41 quiet splash skew_tick=1 isolcpus=managed_irq,domain,2-39,42-79 intel_pstate=disable nosoftlockup tsc=nowatchdog skew_tick=1  vt.handoff=7

The current BIOS settings are attached as image.

I tried using following frequency settings without any luck:

cpupower frequency-set -g performance

cpupower frequency-set -u 2500000

cpupower frequency-info

The question is how can I lock the CPU frequency to 2.5GHz, on the isolated cores, when running the 5G RAN node using Intel FlexRAN?


Thanks!

[pujeeth]

Hello Amurg,

Greetings!!

Thank you for trusting Intel with your business. As with all good things, your product has reached the end of its interactive technical support life. However, you can find Intel® Xeon® Gold 6248 Processor (27.5M Cache, 2.50 GHz) recommendations at Intel Community forums and additional information at the Discontinued Products website. It is our pleasure to continue to serve you with the next generation of Intel innovation at Intel.com.

Regards,

Pujeeth

Intel Customer Support Technician