请参阅下面的代码片段，它们提供了一个解决方案。在你的项目中尝试实现类似的东西之前，一定要从头到尾读一遍。此外，请注意，为了简洁起见，所有关键错误处理都已删除，并且应重新添加到任何类似的实现中。
register_external_buffers()在巨大的页面中分配外部存储器区域，并将它们注册到DPDK中。

unsigned register_external_buffers(rte_device* device, uint32_t num_mbufs, uint16_t mbuf_size, unsigned socket, rte_pktmbuf_extmem **ext_mem)
{
    rte_pktmbuf_extmem *extmem_array; // Array of external memory descriptors
    unsigned elements_per_zone; // Memory is reserved and registered in zones
    unsigned n_zones; // Number of zones needed to accomodate all mbufs
    uint16_t element_size; // Size, in bytes, of one mbuf element
    int status; // Used to store error codes / return values

    element_size = RTE_ALIGN_CEIL(mbuf_size, 4096);
    elements_per_zone = RTE_PGSIZE_1G / element_size;
    n_zones = (num_mbufs / elements_per_zone) + ((num_mbufs % elements_per_zone) ? 1 : 0);
    extmem_array = new rte_pktmbuf_extmem[n_zones];

    for (int extmem_index = 0; extmem_index < n_zones; extmem_index++) 
    {
        rte_pktmbuf_extmem *current_extmem = extmem_array + extmem_index;
        current_extmem->buf_ptr = mmap(NULL, RTE_PGSIZE_1G, PROT_READ | PROT_WRITE, MAP_HUGETLB | MAP_SHARED | MAP_ANONYMOUS | MAP_POPULATE | MAP_LOCKED, -1, 0);
        current_extmem->buf_iova = NULL;
        current_extmem->buf_len = RTE_PGSIZE_1G;
        current_extmem->elt_size = element_size;

        rte_extmem_register(current_extmem->buf_ptr, current_extmem->buf_len, NULL, 0, RTE_PGSIZE_1G);
        rte_dev_dma_map(device, current_extmem->buf_ptr, (rte_iova_t) current_extmem->buf_ptr, current_extmem->buf_len);
    }
    *ext_mem = extmem_array;
    return n_zones;
}

然后register_external_buffers可以如下使用：

rte_eth_dev_info dev_info;
rte_eth_dev_info_get(port_id, &dev_info);
unsigned length = register_external_buffers(dev_info.device, num_bufs, mbuf_size, cpu_socket, &extmem);

m_rx_pktbuf_pools.at(cpu_socket) = rte_pktmbuf_pool_create_extbuf(name, num_bufs, DPDK_MBUF_CACHE_SIZE, 0, mbuf_size, cpu_socket, extmem, length);

虽然这确实会导致所有mbuf数据都在外部内存区域中存储和对齐，但它们会对齐到巨大的页面--而不是典型的4k页面。这意味着，虽然最初的问题得到了解决，但由于页面边界的数量非常有限，因此该解决方案对于该用例来说并不是非常实用。