<div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> On Thu, 25 May 2023 05:36:02 +0000 "Lombardo, Ed" <<a href="mailto:Ed.Lombardo@netscout.com" target="_blank">Ed.Lombardo@netscout.com</a>> wrote: > 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? This is a new scenario. I doubt it. It is possible to have two processes an a common hugepage pool. > 2. Do I need to specify -proc-type for each Process shown above for argument to the rte_eal_init()? The problem is that DPDK uses a runtime directory to communicate. If you want two disjoint DPDK primary processes, you need to set the runtime directory. > 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 </blockquote><div> </div><div>To add to what Stephen said, to point to different directories for separate processes use --file-prefix </div></div></div>