Failure while allocating 1GB hugepages

[Antonio Di Bacco]

I have 16 hugepages available per NUMA on a 4 NUMA system:

[user at node-1 hugepages]$ cat
/sys/devices/system/node/*/hugepages/hugepages-1048576kB/free_hugepages
16
16
16
16

Using the following program with dpdk 21.11, sometimes I can allocate
a few pages but most of the time I cannot. I tried also to remove
rtemap_* under /dev/hugepages.
rte_memzone_reserve_aligned is always supposed to use a new page?

#include <stdio.h>
#include <rte_eal.h>
#include <rte_memzone.h>

#include <rte_errno.h>
#include <unistd.h>

int main(int argc, char **argv)
{
    const struct rte_memzone *mz;
    int ret;
    printf("pid: %d\n", getpid());
    // Initialize EAL
    ret = rte_eal_init(argc, argv);
    if (ret < 0) {
        fprintf(stderr, "Error with EAL initialization\n");
        return -1;
    }

    for (int socket = 0; socket < 4; socket++)
    {
      for (int i = 0; i < 16; i++)
      {
        // Allocate memory using rte_memzone_reserve_aligned
        char name[32];
        sprintf(name, "my_memzone%d-%d", i, socket);
        mz = rte_memzone_reserve_aligned(name, 1ULL << 30, socket,
RTE_MEMZONE_IOVA_CONTIG, 1ULL << 30);

        if (mz == NULL) {
          printf("errno %s\n", rte_strerror(rte_errno));
          fprintf(stderr, "Memory allocation failed\n");
          rte_eal_cleanup();
          return -1;
      }

      printf("Memory allocated with name %s at socket %d physical
address: %p, addr %p addr64 %lx size: %zu\n", name, mz->socket_id,
(mz->iova), mz->addr, mz->addr_64, mz->len);
    }
    }

    // Clean up EAL
    rte_eal_cleanup();
    return 0;
}