[dpdk-dev] l2fwd mmap memory failed

Zhang, Jerry jerry.zhang at intel.com
Sun Sep 14 13:12:49 CEST 2014


Hi,

>-----Original Message-----
>From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of jerry
>Sent: Sunday, September 14, 2014 5:01 PM
>To: dev at dpdk.org
>Cc: luonengjun at huawei.com
>Subject: [dpdk-dev] l2fwd mmap memory failed
>
>Hi all,
>
>The l2fwd sample application starts failed in my environment with 90000 2M
>hugepages set up.
>It tells me that mmap failed: Cannot allocate memory.
>Is there a limited max hugepages or memory size for dpdk to mmap EAL
>memory?
>
>Some information as follows:
>
>1. Environment:
>Host OS: Suse11 Sp3 x86_64
>NIC: intel 82599
>DPDK: 1.6.0r2
>
>2. Hugepage Configuration in Kernel command line:
>hugepagesz=2M default_hugepagesz=2M hugepages=90000
>
>3. l2fwd command line:
>./build/l2fwd -c 0x3 -n 3 --socket-mem 2048 -- -q 1 -p 3
>
>4. cat /proc/meminfo:
>HugePages_Total:   90000
>HugePages_Free:    90000
>HugePages_Rsvd:        0
>HugePages_Surp:        0
>Hugepagesize:       2048 kB
>
>5. Error messages in dpdk log:
>Sun Sep 14 08:37:28 2014:EAL: Detected lcore 0 as core 0 on socket 0 Sun Sep 14
>08:37:28 2014:EAL: Detected lcore 1 as core 1 on socket 0 Sun Sep 14 08:37:28
>2014:EAL: Setting up memory...
>Sun Sep 14 08:38:44 2014:EAL: map_all_hugepages(): mmap failed: Cannot
>allocate memory Sun Sep 14 08:38:44 2014:EAL: Failed to mmap 2 MB
>hugepages Sun Sep 14 08:38:44 2014:EAL: Cannot init memory Sun Sep 14
>08:38:44 2014:EAL: Error - exiting with code: 1
>  Cause: Sun Sep 14 08:38:44 2014:Invalid EAL parameters
>
>
>Anyone know the issue and the corresponding fix? Thanks.

It's a system mmap failure. 
As you have to map so many huge pages, I suggest that you check /proc/sys/vm/max_map_count to see if the map count exceeds the max value.


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