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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal">I have two DPDK processes in our application, where one process allocates 1024 2MB hugepages and the second process allocates 8 1GB hugepages.<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Script that preconditions the hugepages:<o:p></o:p></p>
<p class="MsoNormal">Process 1:<o:p></o:p></p>
<p class="MsoNormal">mkdir /mnt/huge<o:p></o:p></p>
<p class="MsoNormal">mount -t hugetlbfs -o pagesize=2M nodev /mnt/huge<o:p></o:p></p>
<p class="MsoNormal">echo 1024 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Process 2:<o:p></o:p></p>
<p class="MsoNormal">mkdir /dev/hugepages-1024<o:p></o:p></p>
<p class="MsoNormal">mount -t hugetlbfs -o pagesize=1G none /dev/hugepages-1024<o:p></o:p></p>
<p class="MsoNormal">echo 8 >/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Application – <o:p></o:p></p>
<p class="MsoNormal">Process 1 DPDK EAL arguments:<o:p></o:p></p>
<p class="MsoNormal">Const char *argv[] = { "app1", "-c", "7fc", "-n", "4", "--huge-dir", "/dev/hugepages-1024", "--proc-type", "secondary"};<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Process 2 DPDK EAL arguments:<o:p></o:p></p>
<p class="MsoNormal">const char *dpdk_argv_2gb[6] = {"app1 ", "-c0x2", "-n4" , "--socket-mem=2048", "--huge-dir /mnt/huge", "--proc-type primary"};<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Questions:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Does DPDK support two hugepage sizes (2MB and 1GB) sharing app1?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Do I need to specify –proc-type for each Process shown above for argument to the rte_eal_init()?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">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?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">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.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Ed<o:p></o:p></p>
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