[dpdk-dev] CONFIG_RTE_MAX_MEM_MB fails in DPDK18.05

Kamaraj P pkamaraj at gmail.com
Wed Feb 19 12:16:10 CET 2020


Hi Kevin/Anatoly,

Yes we have the patch already included in our code base.

Looks like it get struck in the below piece of the code:
mapped_addr = mmap(requested_addr, (size_t)map_sz, PROT_READ,
                                mmap_flags, -1, 0);

Could you please share your thoughts on this?

Thanks,
Kamaraj

On Wed, Feb 19, 2020 at 4:26 PM Kevin Traynor <ktraynor at redhat.com> wrote:

> On 19/02/2020 10:23, Burakov, Anatoly wrote:
> > On 17-Feb-20 9:57 AM, Kamaraj P wrote:
> >> Hi Anatoly,
> >> Thanks for the clarifications.
> >>
> >> Currently we are migrating to the new DPDK 18.11 ( from 17.05).  Here
> is
> >> our configuration:
> >> =======================================================================
> >> We have configured the "--legacy-mem" option and changed the
> >> CONFIG_RTE_MAX_MEM_MB to 2048 (and we are passing 2MB huge page 188 and
> >> no 1G hugepages in the bootargs).
> >> Our application deployment as 2G RAM
> >> =======================================================================
> >> We are observing the hang issue, with above configuration.
> >> Please see the below logs:
> >> EAL: Detected lcore 0 as core 0 on socket 0
> >> EAL: Support maximum 128 logical core(s) by configuration.
> >> EAL: Detected 1 lcore(s)
> >> EAL: Detected 1 NUMA nodes
> >> EAL: open shared lib /usr/lib64/librte_pmd_ixgbe.so.2.1
> >> EAL: open shared lib /usr/lib64/librte_pmd_e1000.so.1.1
> >> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> >> EAL: Module /sys/module/vfio_pci not found! error 2 (No such file or
> >> directory)
> >> EAL: VFIO PCI modules not loaded
> >> EAL: No free hugepages reported in hugepages-1048576kB
> >> EAL: No free hugepages reported in hugepages-1048576kB
> >> EAL: Probing VFIO support...
> >> EAL: Module /sys/module/vfio not found! error 2 (No such file or
> directory)
> >> EAL: VFIO modules not loaded, skipping VFIO support...
> >> EAL: Ask a virtual area of 0x2e000 bytes
> >> EAL: Virtual area found at 0x100000000 (size = 0x2e000)
> >> EAL: Setting up physically contiguous memory...
> >> EAL: Setting maximum number of open files to 4096
> >> EAL: Detected memory type: socket_id:0 hugepage_sz:1073741824
> >> EAL: Detected memory type: socket_id:0 hugepage_sz:2097152
> >> EAL: Creating 1 segment lists: n_segs:1 socket_id:0
> hugepage_sz:1073741824
> >> EAL: Ask a virtual area of 0x1000 bytes
> >> EAL: Virtual area found at 0x10002e000 (size = 0x1000)
> >> EAL: Memseg list allocated: 0x100000kB at socket 0
> >> EAL: Ask a virtual area of 0x40000000 bytes
> >> <<< --- struck here ---> >>>>
> >>
> >>
> >> Is there any other dpdk options thro which we can resolve the above
> >> issue ? Any thoughts ?
> >> Like passing the *--socket-limit* and *--m *parameter etc during the
> EAL
> >> Init (could help ???).
> >> Please suggest us.
> >>
> >
> > It sounds like it hangs in eal_get_virtual_area() - we've had a similar
> > issue before, not sure if the fix was backported to 18.11. Is this patch
> > present in your code?
> >
> > http://patches.dpdk.org/patch/51943/
> >
>
> In 18.11 LTS releases since v18.11.2. Current release is v18.11.6.
>
> commit 558509fbb2b0a0f5803f348634e4956ff8cb5214
> Author: Shahaf Shuler <shahafs at mellanox.com>
> Date:   Sun Mar 31 11:43:48 2019 +0300
>
>     mem: limit use of address hint
>
>     [ upstream commit 237060c4ad15b4ee9002be3c0e56ac3070eceb48 ]
>
> > If not, it would be of great help if you could find the exact spot where
> > the hang happens.
> >
>
>
>
>
>


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