[dpdk-users] 答复: How can create a mempool more than 20GB?

[宋捷]

Hi Stephen，

Expert，you are correct, 
I update the default hugepage size from 2M to 1G, it's worked.

Thanks you very much！


Jie



-----邮件原件-----
发件人: Stephen Hemminger [mailto:stephen at networkplumber.org] 
发送时间: 2019年9月11日 1:36
收件人: 宋捷 <songj at zctt.com>
抄送: 'users' <users at dpdk.org>; 'Van Haaren, Harry' <harry.van.haaren at intel.com>
主题: Re: How can create a mempool more than 20GB?

On Tue, 10 Sep 2019 19:02:37 +0800
宋捷 <songj at zctt.com> wrote:

> Hi All,
> 
>  
> 
>        I assigned 40GB hugepages for each node.
> 
> 
> 
>  
> 
>        I need a huge mempool buffer (20GB) for save received packets, 
> I create a mempool as follow:
> 
> rte_pktmbuf_pool_create("rx_dump_pool",  8*1000*1000, 0, 0, 
> RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id() );
> 
>  
> 
> RTE_MBUF_DEFAULT_BUF_SIZE is 2048+128 , I think 
> rte_pktmbuf_pool_create should create 8*1000*1000*(2176)≈16G buffer,
> 
> But failed with below prompt:
> 
> EAL: eal_memalloc_alloc_seg_bulk(): couldn't find suitable memseg_list
> 
> EAL: eal_memalloc_alloc_seg_bulk(): couldn't find suitable memseg_list
> 
> EAL: Error - exiting with code: 1
> 
>  
> 
> I try to reduce the size, the mempool can be created successfully as follow:
> 
> rte_pktmbuf_pool_create("rx_dump_pool", 5000000, 0, 0, 
> RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id() );
> 
>  
> 
>  
> 
> Does DPDK mempool has a limited size ?  I have no ideal for this L
> 
>  

You are going to need 1G huge pages on this, and a system with very large amount of memory. To setup 1G huge pages requires settings on kernel command line.

Also expect slow startup times with that much memory.