[dpdk-dev] mmap fails with more than 40000 hugepages

Damjan Marion (damarion) damarion at cisco.com
Thu Feb 5 16:41:25 CET 2015
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> On 05 Feb 2015, at 15:59, Neil Horman <nhorman at tuxdriver.com> wrote:
> 
> On Thu, Feb 05, 2015 at 01:20:01PM +0000, Damjan Marion (damarion) wrote:
>> 
>>> On 05 Feb 2015, at 13:59, Neil Horman <nhorman at tuxdriver.com> wrote:
>>> 
>>> On Thu, Feb 05, 2015 at 12:00:48PM +0000, Damjan Marion (damarion) wrote:
>>>> Hi,
>>>> 
>>>> I have system with 2 NUMA nodes and 256G RAM total. I noticed that DPDK crashes in rte_eal_init()
>>>> when number of available hugepages is around 40000 or above.
>>>> Everything works fine with lower values (i.e. 30000).
>>>> 
>>>> I also tried with allocating 40000 on node0 and 0 on node1, same crash happens.
>>>> 
>>>> 
>>>> Any idea what might be causing this?
>>>> 
>>>> Thanks,
>>>> 
>>>> Damjan
>>>> 
>>>> 
>>>> $ cat /sys/devices/system/node/node[01]/hugepages/hugepages-2048kB/nr_hugepages
>>>> 20000
>>>> 20000
>>>> 
>>>> $ grep -i huge /proc/meminfo
>>>> AnonHugePages:    706560 kB
>>>> HugePages_Total:   40000
>>>> HugePages_Free:    40000
>>>> HugePages_Rsvd:        0
>>>> HugePages_Surp:        0
>>>> Hugepagesize:       2048 kB
>>>> 
>>> Whats your shmmax value set to? 40000 2MB hugepages is way above the default
>>> setting for how much shared ram a system will allow.  I've not done the math on
>>> your logs below, but judging by the size of some of the mapped segments, I'm
>>> betting your hitting the default limit of 4GB.
>> 
>> $ cat /proc/sys/kernel/shmmax
>> 33554432
>> 
>> $ sysctl -w kernel.shmmax=8589934592
>> kernel.shmmax = 8589934592
>> 
>> same crash :(
>> 
>> Thanks,
>> 
>> Damjan
> 
> What about the shmmni and shmmax values.  The shmmax value will also need to be
> set to at least 80G (more if you have other shared memory needs), and shmmni
> will need to be larger than 40,000 to handle all the segments your creating.
> Neil

Hmm, if that is the reason, then 30000 will also not work. as both values are set by default to much much lower value.

Anyway, I tried:

$ sysctl kernel.shmmni
kernel.shmmni = 100000

$ sysctl kernel.shmmax
kernel.shmmax = 274877906944

$ cat /sys/devices/system/node/node[01]/hugepages/hugepages-2048kB/nr_hugepages
20000
20000

$ sudo ~/src/dpdk/x86_64-native-linuxapp-gcc/app/testpmd -l 5-7 -n 3 --socket-mem 512,512
EAL: Detected lcore 0 as core 0 on socket 0
EAL: Detected lcore 1 as core 1 on socket 0
EAL: Detected lcore 2 as core 2 on socket 0
EAL: Detected lcore 3 as core 3 on socket 0
EAL: Detected lcore 4 as core 4 on socket 0
EAL: Detected lcore 5 as core 5 on socket 0
EAL: Detected lcore 6 as core 6 on socket 0
EAL: Detected lcore 7 as core 7 on socket 0
EAL: Detected lcore 8 as core 0 on socket 1
EAL: Detected lcore 9 as core 1 on socket 1
EAL: Detected lcore 10 as core 2 on socket 1
EAL: Detected lcore 11 as core 3 on socket 1
EAL: Detected lcore 12 as core 4 on socket 1
EAL: Detected lcore 13 as core 5 on socket 1
EAL: Detected lcore 14 as core 6 on socket 1
EAL: Detected lcore 15 as core 7 on socket 1
EAL: Detected lcore 16 as core 0 on socket 0
EAL: Detected lcore 17 as core 1 on socket 0
EAL: Detected lcore 18 as core 2 on socket 0
EAL: Detected lcore 19 as core 3 on socket 0
EAL: Detected lcore 20 as core 4 on socket 0
EAL: Detected lcore 21 as core 5 on socket 0
EAL: Detected lcore 22 as core 6 on socket 0
EAL: Detected lcore 23 as core 7 on socket 0
EAL: Detected lcore 24 as core 0 on socket 1
EAL: Detected lcore 25 as core 1 on socket 1
EAL: Detected lcore 26 as core 2 on socket 1
EAL: Detected lcore 27 as core 3 on socket 1
EAL: Detected lcore 28 as core 4 on socket 1
EAL: Detected lcore 29 as core 5 on socket 1
EAL: Detected lcore 30 as core 6 on socket 1
EAL: Detected lcore 31 as core 7 on socket 1
EAL: Support maximum 128 logical core(s) by configuration.
EAL: Detected 32 lcore(s)
EAL: VFIO modules not all loaded, skip VFIO support...
EAL: Setting up memory...
EAL: Ask a virtual area of 0x80000000 bytes
EAL: Virtual area found at 0x7fe280000000 (size = 0x80000000)
EAL: Ask a virtual area of 0x80000000 bytes
EAL: Virtual area found at 0x7fe1c0000000 (size = 0x80000000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe335c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x9400000 bytes
EAL: Virtual area found at 0x7fe32c600000 (size = 0x9400000)
EAL: Ask a virtual area of 0x5c00000 bytes
EAL: Virtual area found at 0x7fe326800000 (size = 0x5c00000)
EAL: Ask a virtual area of 0x38e00000 bytes
EAL: Virtual area found at 0x7fe247000000 (size = 0x38e00000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe326400000 (size = 0x200000)
EAL: Ask a virtual area of 0x8000000 bytes
EAL: Virtual area found at 0x7fe31e200000 (size = 0x8000000)
EAL: Ask a virtual area of 0x815800000 bytes
EAL: Virtual area found at 0x7fd9aa600000 (size = 0x815800000)
EAL: Ask a virtual area of 0x1f400000 bytes
EAL: Virtual area found at 0x7fd98b000000 (size = 0x1f400000)
EAL: Ask a virtual area of 0xfd400000 bytes
EAL: Virtual area found at 0x7fd88da00000 (size = 0xfd400000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31de00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31da00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31d600000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31d200000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31ce00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31ca00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31c600000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31c200000 (size = 0x200000)
EAL: Ask a virtual area of 0x400000 bytes
EAL: Virtual area found at 0x7fe31bc00000 (size = 0x400000)
EAL: Ask a virtual area of 0x400000 bytes
EAL: Virtual area found at 0x7fe31b600000 (size = 0x400000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31b200000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31ae00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31aa00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31a600000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe31a200000 (size = 0x200000)
EAL: Ask a virtual area of 0x400000 bytes
EAL: Virtual area found at 0x7fe319c00000 (size = 0x400000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe319800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe319400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe319000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe318c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe318800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe318400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe318000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe317c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe317800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe317400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe317000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe316c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe316800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe316400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe316000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe315c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe315800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe315400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe315000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe314c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe314800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe314400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe314000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe313c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe313800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe313400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe313000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe312c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe312800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe312400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe312000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe311c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe311800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe311400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe311000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe310c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe310800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe310400000 (size = 0x200000)
EAL: Ask a virtual area of 0x400000 bytes
EAL: Virtual area found at 0x7fe30fe00000 (size = 0x400000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30fa00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30f600000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30f200000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30ee00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30ea00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30e600000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30e200000 (size = 0x200000)
EAL: Ask a virtual area of 0x400000 bytes
EAL: Virtual area found at 0x7fe30dc00000 (size = 0x400000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30d800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30d400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30d000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30cc00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30c800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30c400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30c000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30bc00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30b800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30b400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30b000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30ac00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30a800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30a400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe30a000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe309c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe309800000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe309400000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe309000000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe308c00000 (size = 0x200000)
EAL: Ask a virtual area of 0x200000 bytes
EAL: Virtual area found at 0x7fe308800000 (size = 0x200000)
EAL: Ask a virtual area of 0x2f800000 bytes
EAL: Virtual area found at 0x7fd85e000000 (size = 0x2f800000)
EAL: Ask a virtual area of 0x7400000 bytes
EAL: Virtual area found at 0x7fe301200000 (size = 0x7400000)
EAL: Ask a virtual area of 0x9b5400000 bytes
EAL: Virtual area found at 0x7fcea8a00000 (size = 0x9b5400000)
EAL: map_all_hugepages(): mmap failed: Cannot allocate memory
EAL: Failed to remap 2 MB pages
PANIC in rte_eal_init():
Cannot init memory
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