Part 3. Configure the gNB Server#

To install the Aerial tools, follow the cuBB installation guide; refer to the Software Manifest for a link to the cuBB documentation.

Configure gNB Server - SMC Grace Hopper MGX#

To install the Aerial cuBB tools, follow the same steps as the Grace Hopper MGX installation guide.

The ARC-OTA thread-to-core assignment functionality is different from a standard Aerial installation. Layer 1 threads need to be isolated in a monolithic block and have been moved, with the rest left to layers 2 and higher. Cores [5,7,9,11,13] are used as cuPHY worker cores. Core 17 is used for the cuPHY lowprio thread; core 15 is used for the cuPHY timer thread; and core 41 is used for PTP and PHC2SYS.

Configure the Linux Kernel Command Line for ARC-OTA#

To set kernel command-line parameters, edit the GRUB_CMDLINE_LINUX parameter in the grub file /etc/default/grub.d/cmdline.cfg and append or update the parameters described below. The following kernel parameters are optimized for GH200. To automatically append the grub file with these parameters, use this command:

cat <<"EOF" | sudo tee /etc/default/grub.d/cmdline.cfg
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX pci=realloc=off pci=pcie_bus_safe default_hugepagesz=512M hugepagesz=512M hugepages=32 tsc=reliable processor.max_cstate=0 audit=0 idle=poll rcu_nocb_poll nosoftlockup irqaffinity=0 isolcpus=managed_irq,domain,4-47 nohz_full=4-47 rcu_nocbs=4-47 earlycon module_blacklist=nouveau acpi_power_meter.force_cap_on=y numa_balancing=disable init_on_alloc=0 preempt=none"
EOF

Apply the Changes and Load the Kernel#

  1. Use the following commands to apply the command-line changes and reboot the system.

    sudo update-grub
sudo reboot

  2. After rebooting, use the following command to check whether the system has booted into the low-latency kernel:

    uname -r
6.2.0-1012-nvidia-64k

  3. Enter this command to check that the kernel command-line parameters are configured correctly:

    cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-6.2.0-1012-nvidia-64k root=/dev/mapper/ubuntu--vg-ubuntu--lv ro pci=realloc=off pci=pcie_bus_safe default_hugepagesz=512M hugepagesz=512M hugepages=32 tsc=reliable processor.max_cstate=0 audit=0 idle=poll rcu_nocb_poll nosoftlockup irqaffinity=0 isolcpus=managed_irq,domain,4-47 nohz_full=4-47 rcu_nocbs=4-47 earlycon module_blacklist=nouveau acpi_power_meter.force_cap_on=y numa_balancing=disable init_on_alloc=0 preempt=none

Change the Core for ptp4l and phc2sys#

Edit the /lib/systemd/system/ptp4l.service file:

ExecStart=taskset -c 41 /usr/sbin/ptp4l -f /etc/ptp.conf

Edit the /lib/systemd/system/phc2sys.service file:

ExecStart=/bin/sh -c "taskset -c 41 /usr/sbin/phc2sys -s /dev/ptp\$(ethtool -T aerial00 | grep PTP | awk '{print \$4}') -c CLOCK_REALTIME -n 24 -O 0 -R 256 -u 256"
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