Re: [dpdk-dev] [PATCH] config: reduce memory requirements for DPDK

[Thomas Monjalon <thomas@monjalon.net>]

24/07/2018 12:03, Anatoly Burakov:
> It has been reported that current memory limitations do not work
> well on an 8-socket machines in default configuration when big
> page sizes are used [1].
> 
> Fix it by reducing memory amount reserved by DPDK by default to
> 32G per page size per NUMA node. This translates to allowing us
> to reserve 32G per page size per NUMA node on 8 nodes with 2
> page sizes.
> 
> [1] https://mails.dpdk.org/archives/dev/2018-July/108071.html
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> ---
> 
> Notes:
>     We could have increased CONFIG_RTE_MAX_MEM_MB but this would've
>     brought other potential problems due to increased memory
>     preallocation, and secondary process initialization is flaky
>     enough as it is. I am willing to bet that 32G per page size is
>     more than enough for the majority of use cases, and any
>     application with bigger requirements could adjust config options
>     itself.
[...]
> -CONFIG_RTE_MAX_MEMSEG_PER_TYPE=32768
> -CONFIG_RTE_MAX_MEM_MB_PER_TYPE=131072
> +CONFIG_RTE_MAX_MEMSEG_PER_TYPE=16384
> +CONFIG_RTE_MAX_MEM_MB_PER_TYPE=32768

Ideally, it should be a run-time option.