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* [dpdk-users] Unable to setup hugepages
@ 2021-05-31 15:35 Gabriel Danjon
  2021-06-01  7:58 ` Thomas Monjalon
  0 siblings, 1 reply; 3+ messages in thread
From: Gabriel Danjon @ 2021-05-31 15:35 UTC (permalink / raw)
  To: users
  Cc: Alexis DANJON, Antoine LORIN, Laurent CHABENET, gregory.fresnais,
	Julien RAMET

Hello,

After successfully installed the DPDK 20.11 on my Centos 8-Stream 
(minimal), I am trying to configure the hugepages but encounters a lot 
of difficulties.


I am trying to reserve 4 hugepages of 1GB.


Here the steps I have done following the documentation 
(https://doc.dpdk.org/guides-20.11/linux_gsg/sys_reqs.html):

Additional information about meminfo :

cat /proc/meminfo
MemTotal:       32619404 kB
MemFree:        27331024 kB
MemAvailable:   27415524 kB
Buffers:            4220 kB
Cached:           328628 kB
SwapCached:            0 kB
Active:           194828 kB
Inactive:         210156 kB
Active(anon):       1744 kB
Inactive(anon):    83384 kB
Active(file):     193084 kB
Inactive(file):   126772 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      16474108 kB
SwapFree:       16474108 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         72136 kB
Mapped:            84016 kB
Shmem:             12992 kB
KReclaimable:     211956 kB
Slab:             372852 kB
SReclaimable:     211956 kB
SUnreclaim:       160896 kB
KernelStack:        9120 kB
PageTables:         6852 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    30686656 kB
Committed_AS:     270424 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
Percpu:            28416 kB
HardwareCorrupted:     0 kB
AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:         4194304 kB
DirectMap4k:      225272 kB
DirectMap2M:     4919296 kB
DirectMap1G:    30408704 kB

1 Step follow documentation

bash -c 'echo 2048 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages'

As we're working on a NUMA machine we do this too. (We even do the 
previous step because without it, it provides more errors)

bash -c 'echo 2048 > 
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages' && \
bash -c 'echo 2048 > 
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages'

mkdir /mnt/huge
mount -t hugetlbfs pagesize=1GB /mnt/huge

bash -c 'echo nodev /mnt/huge hugetlbfs pagesize=1GB 0 0 >> /etc/fstab'

So here the result of my meminfo (cat /proc/meminfo | grep Huge) :

AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:         4194304 kB

It looks strange that there is no total and free hugepages.

I tried the dpdk-testpmd using the DPDK documentation : dpdk-testpmd -l 
0-3 -n 4 -- -i --nb-cores=2

EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: 2048 hugepages of size 2097152 reserved, but no mounted hugetlbfs 
found for that size
EAL: No free hugepages reported in hugepages-1048576kB
EAL: No free hugepages reported in hugepages-1048576kB
EAL: No available hugepages reported in hugepages-1048576kB
EAL: FATAL: Cannot get hugepage information.
EAL: Cannot get hugepage information.
EAL: Error - exiting with code: 1
   Cause: Cannot init EAL: Permission denied


So I checked in the /mnt/huge to look if files had been created (ls 
/mnt/huge/ -la) : Empty folder

Then I checked if my folder was correctly mounted : mount | grep huge
pagesize=1GB on /mnt/huge type hugetlbfs 
(rw,relatime,seclabel,pagesize=1024M)

Then I tried the helloworld example (make clean && make && 
./build/helloworld):

EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: 2048 hugepages of size 2097152 reserved, but no mounted hugetlbfs 
found for that size
EAL: No free 1048576 kB hugepages reported on node 0
EAL: No free 1048576 kB hugepages reported on node 1
EAL: No available 1048576 kB hugepages reported
EAL: FATAL: Cannot get hugepage information.
EAL: Cannot get hugepage information.
PANIC in main():
Cannot init EAL
5: [./build/helloworld() [0x40079e]]
4: [/lib64/libc.so.6(__libc_start_main+0xf3) [0x7ff43a6f6493]]
3: [./build/helloworld() [0x4006e6]]
2: [/usr/local/lib64/librte_eal.so.21(__rte_panic+0xba) [0x7ff43aaa4b93]]
1: [/usr/local/lib64/librte_eal.so.21(rte_dump_stack+0x1b) [0x7ff43aac79fb]]
Aborted (core dumped)


So I guessed the problem came from the : Hugepagesize:    1048576 kB 
(from cat /proc/meminfo | grep Huge).


2 Step adapt documentation

Then I decided to set the values for 1048576KB:

bash -c 'echo 4 > 
/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages'
bash -c 'echo 4 > 
/sys/devices/system/node/node1/hugepages/hugepages-1048576kB/nr_hugepages'
bash -c 'echo 4 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages'


So here the result of my meminfo (cat /proc/meminfo | grep Huge) :

AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:       4
HugePages_Free:        4
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:         8388608 kB

So here I have my 4 pages sat.

Then I retried the previous steps and here what I got :

dpdk-testpmd -l 0-3 -n 4 -- -i --nb-cores=2
EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: 2048 hugepages of size 2097152 reserved, but no mounted hugetlbfs 
found for that size
EAL: Probing VFIO support...
testpmd: No probed ethernet devices
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=171456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Done
testpmd>
Bye...


make clean && make && ./build/helloworld
EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: 2048 hugepages of size 2097152 reserved, but no mounted hugetlbfs 
found for that size
TELEMETRY: No legacy callbacks, legacy socket not created


cat /proc/meminfo | grep Huge
AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:       4
HugePages_Free:        3
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:         8388608 kB

One huge page looks like have been used.
ls -l /mnt/huge/
total 1048576
1073741824 rtemap_0

So yes one has been created, but 2048 hugepages of size 2097152 
reserved, but no mounted hugetlbfs found for that size, happens.

So to try to understand what happens I reset 
hugepages-2048kB/nr_hugepages to 0 :
bash -c 'echo 0 > 
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages' && \
bash -c 'echo 0 > 
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages' && \
bash -c 'echo 0 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages'

but : dpdk-testpmd -l 0-3 -n 4 -- -i --nb-cores=2EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: No available hugepages reported in hugepages-2048kB
EAL: Probing VFIO support...
testpmd: No probed ethernet devices
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=171456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Done

So here on this part I really don't understand, my /proc/meminfo tells 
me I need to use the 1048576kB part but dpdk-testpmd the 2048kB.

Then I searched an alternative to these commands in your documentation 
and found : dpdk-hugpages.py


3 Step alternative

https://doc.dpdk.org/guides-20.11/tools/hugepages.html
(There is an error on the documentation : dpdk-hugpages instead of 
dpdk-hugepages)

So I reset every files, and removed my mount and my folder.

umount /mnt/huge
rm -rf /mnt/huge
bash -c 'echo 0 > 
/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages'
bash -c 'echo 0 > 
/sys/devices/system/node/node1/hugepages/hugepages-1048576kB/nr_hugepages'
bash -c 'echo 0 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages'

cat /proc/meminfo | grep Huge
AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:               0 kB


dpdk-hugpages.py -s

Node Pages Size Total

Hugepages not mounted


So here I have an cleaned hugepage environment.
Then I tried to reallocate hugepages with the python script: 
dpdk-hugepages.py -p 1G --setup 4G

dpdk-hugepages.py -s
Node Pages Size Total
0    4     1Gb    4Gb
1    4     1Gb    4G


So I got my 4 pages of 1GB and retried the previous steps :

cat /proc/meminfo | grep Huge
AnonHugePages:     10240 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:       8
HugePages_Free:        8
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
Hugetlb:         8388608 kB

Here it says I got 8 hugepages of 1GB so I don't understand why, because 
the python script tells the opposite.

dpdk-testpmd -l 0-3 -n 4 -- -i --nb-cores=2EAL: Detected 48 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: No available hugepages reported in hugepages-2048kB
EAL: Probing VFIO support...
testpmd: No probed ethernet devices
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=171456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Done

Same for the helloworld.

Then I cleared my environment:

dpdk-hugepages.py -u && dpdk-hugepages.py -c && dpdk-hugepages.py -s
Node Pages Size Total

Hugepages not mounted


Then as the error says that there are no available hugepages reported in 
hugepages-2048kB i tried with Mb :
dpdk-hugepages.py -p 1024M --setup 4G && dpdk-hugepages.py -s
Node Pages Size Total
0    4     1Gb    4Gb
1    4     1Gb    4Gb

But same error happened.


4 Question

So I don't succeed to resolve this issue of testing the DPDK with 
helloworld and dpdk-testpmd.

Have I missed something in the creation of the hugepages ?

Could you please, provide help ?

Best,


-- 

Gabriel Danjon


^ permalink raw reply	[flat|nested] 3+ messages in thread
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2021-05-31 15:35 [dpdk-users] Unable to setup hugepages Gabriel Danjon
2021-06-01  7:58 ` Thomas Monjalon
2021-06-02 15:35   ` Gabriel Danjon

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