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

[Burakov, Anatoly]

On 24-Jul-18 11:23 AM, Thomas Monjalon wrote:
> 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 at 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.
> 

It can be, yes, and this can be worked on for next release. However, we 
also need to have good default values that work across all supported 
platforms.

-- 
Thanks,
Anatoly