SPDK EAL: No free 2048kB hugepages reported on node 0

The error message ‘SPDK EAL: No free 2048kB hugepages reported on node 0’ indicates that the system is unable to allocate the required amount of hugepages on node 0. Hugepages are a memory management feature in Linux that allows for larger memory pages, which can improve performance for certain workloads, such as database and scientific computing.

To resolve this issue, you can try the following troubleshooting steps:

1. Check Hugepage Configuration: First, verify that hugepages are properly configured on your system. You can check the current hugepage configuration by running the following command:

cat /proc/meminfo | grep Hugepages

If hugepages are not enabled, you may need to enable them by modifying the kernel parameters during boot or permanently by editing the grub configuration file.

1. Increase Hugepage Count: If hugepages are already enabled, you can try increasing the number of hugepages available to your system. You can do this by modifying the hugepage allocation in the system’s memory cgroup. Run the following command to set the hugepage limit:

echo '2048K' > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

Replace ‘node0’ with the appropriate node number for your system.

1. Restart SPDK Service: After making any configuration changes, restart the SPDK service to apply the changes. You can use the following command to restart the SPDK service:

systemctl restart spdk_nvme_service

1. Check Hugepage Usage: Verify that the hugepages are being used by SPDK. You can check the hugepage usage by running the following command:

cat /proc/meminfo | grep HugePages_Total

If the number of hugepages reported is zero, it indicates that SPDK is not utilizing hugepages. In this case, you may need to investigate why SPDK is not utilizing hugepages correctly.

1. Check SPDK Configuration: Check the SPDK configuration to ensure that it is correctly configured to use hugepages. Verify that the SPDK configuration file (e.g., spdk_config.json) has the appropriate settings for hugepage usage.
2. Update Kernel Version: If you are using an older kernel version, consider updating to a newer version that supports hugepages. Sometimes, kernel updates can resolve issues related to hugepage allocation.
3. System Resources: If your system has limited resources, such as RAM or CPU, it may be difficult to allocate enough hugepages. In this case, consider increasing the system resources or optimizing other resource-intensive processes running on the system.
4. Reboot System: If none of the troubleshooting steps resolve the issue, rebooting your system may help clear any lingering issues related to hugepage allocation.

Remember to refer to the SPDK documentation for detailed information about configuring and troubleshooting SPDK on your system.