Hi,

I have two DPDK processes in our application, where one process allocates 1024 2MB hugepages and the second process allocates 8 1GB hugepages.

I am allocating hugepages in a script before the application starts.  This is to satisfy different configuration settings and I don’t want to write to grub when second DPDK process is enabled or disabled.

Script that preconditions the hugepages:

Process 1:

mkdir /mnt/huge

mount -t hugetlbfs -o pagesize=2M nodev /mnt/huge

echo  1024  > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

Process 2:

mkdir /dev/hugepages-1024

mount -t hugetlbfs -o pagesize=1G none /dev/hugepages-1024

echo 8 >/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages

Application –

Process 1 DPDK EAL arguments:

Const char *argv[] = { "app1", "-c", "7fc", "-n", "4", "--huge-dir", "/dev/hugepages-1024", "--proc-type", "secondary"};

Process 2 DPDK EAL arguments:

const  char *dpdk_argv_2gb[6]  = {"app1 ", "-c0x2", "-n4" , "--socket-mem=2048", "--huge-dir /mnt/huge", "--proc-type primary"};

Questions:

1. Does DPDK support two hugepage sizes (2MB and 1GB) sharing app1?
2. Do I need to specify –proc-type for each Process shown above for argument to the rte_eal_init()?
3. I find the files in /dev/hugpages/rtemap_#s are not present once Process 2 hugepages-1G/nr_hugepages are set to 8, but when set value to 1 the /dev/hugepages/rtemap_# files (1024) are present.  I can’t see how to resolve this issue.  Any suggestions?
4. Do I need to set –socket-mem to the total memory of both Processes, or are they separately defined?  I have one NUMA node in this VM.

Thanks,

Ed