[dpdk-dev] rte_mempool_create_empty/rte_mempool_populate_virt question

[Mihail Tarta]

Hi,

I am wondering if the following behavior is a bug or it is by design. My 
scenario is the following. Let’s say that I create a file of 8MB and then mmap 
and mlock that in my application. I call rte_mempool_create_empty with elt_size 
of 4096 (getpagesize) and correct element count. Then I call 
rte_mempool_populate_virt for that empty mempool using with the end 2MB of 
memory from the mmap created from the 8MB file. This call always fails with 
EINVAL. Any other elt_size used for exactly the same scenario (64, 128, 256, 
512, 1024, 2048) always succeeds without a problem. In all tests the file gets 
mapped at the same base address in my app. What am I doing wrong?

Thanks,
Mihail