[dpdk-dev] Reg 6Wind fastpath DPDK 18.11.1 virtual memory allocation ( 54.5GB of anonymous mapping)

[Shanmugasundaram M]

 Dear Team,

We are using  6Wind fastpath(fp-rte) which is using DPDK version 18.11.1.
We are seeing  65.5G(preallocated during startup) of virtual memory for
fp-rte on a 32GB machine, 10G of that was huge pages (5000 mappings of 2M.)

We found 4 strange anon (4K size) segments totaling 54.5G (16+16+16+6.5).
Note: we changed / customized memory CONFIG_RTE_MAX_MEMSEG_PER_LIST=24576
and default value of  CONFIG_RTE_MAX_MEMSEG_LISTS=64 used.
Kindly let us know
1. Why are allocating  54.5 GB anonymous mapping
2. When will we use it ?
Appreciate your quick response.

Regards,
Shanmugasundaram M