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From: "Lombardo, Ed" <Ed.Lombardo@netscout.com>
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Subject: DPDK hugepages
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Hi,
I have two DPDK processes in our application, where one process allocates 1=
024 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=3D2M 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=3D1G none /dev/hugepages-1024
echo 8 >/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hug=
epages
Application -
Process 1 DPDK EAL arguments:
Const char *argv[] =3D { "app1", "-c", "7fc", "-n", "4", "--huge-dir", "/de=
v/hugepages-1024", "--proc-type", "secondary"};
Process 2 DPDK EAL arguments:
const char *dpdk_argv_2gb[6] =3D {"app1 ", "-c0x2", "-n4" , "--socket-mem=
=3D2048", "--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 argu=
ment to the rte_eal_init()?
3. I find the files in /dev/hugpages/rtemap_#s are not present once Proc=
ess 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 resolv=
e this issue. Any suggestions?
4. Do I need to set -socket-mem to the total memory of both Processes, o=
r are they separately defined? I have one NUMA node in this VM.
Thanks,
Ed
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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"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=3D"MsoNormal">I am allocating hugepages in a script before the app=
lication 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=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Script that preconditions the hugepages:<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Process 1:<o:p></o:p></p>
<p class=3D"MsoNormal">mkdir /mnt/huge<o:p></o:p></p>
<p class=3D"MsoNormal">mount -t hugetlbfs -o pagesize=3D2M nodev /mnt/huge<=
o:p></o:p></p>
<p class=3D"MsoNormal">echo 1024 > /sys/devices/system/node/=
node0/hugepages/hugepages-2048kB/nr_hugepages<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Process 2:<o:p></o:p></p>
<p class=3D"MsoNormal">mkdir /dev/hugepages-1024<o:p></o:p></p>
<p class=3D"MsoNormal">mount -t hugetlbfs -o pagesize=3D1G none /dev/hugepa=
ges-1024<o:p></o:p></p>
<p class=3D"MsoNormal">echo 8 >/sys/devices/system/node/node0/hugepages/=
hugepages-1048576kB/nr_hugepages<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Application – <o:p></o:p></p>
<p class=3D"MsoNormal">Process 1 DPDK EAL arguments:<o:p></o:p></p>
<p class=3D"MsoNormal">Const char *argv[] =3D { "app1", "-c&=
quot;, "7fc", "-n", "4", "--huge-dir&quo=
t;, "/dev/hugepages-1024", "--proc-type", "seconda=
ry"};<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Process 2 DPDK EAL arguments:<o:p></o:p></p>
<p class=3D"MsoNormal">const char *dpdk_argv_2gb[6] =3D {"=
app1 ", "-c0x2", "-n4" , "--socket-mem=3D2048=
", "--huge-dir /mnt/huge", "--proc-type primary"};=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Questions:<o:p></o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"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=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list=
:l0 level1 lfo1">Do I need to specify –proc-type for each Process sho=
wn above for argument to the rte_eal_init()?<o:p></o:p></li><li class=3D"Ms=
oListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 lfo1">I find th=
e 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/r=
temap_# files (1024)
are present. I can’t see how to resolve this issue. Any =
suggestions?<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"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 ha=
ve one NUMA node in this VM.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Ed<o:p></o:p></p>
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