DPDK hugepages

["Lombardo, Ed" <Ed.Lombardo@netscout.com>]

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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

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