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#
Use the following commands to apply the command-line changes and reboot the system.
sudo update-grub sudo reboot
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
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"