24/07/2018 13:04, 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.bura...@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.
Yes sure, we can wait the next release for a run-time option. How can we be sure these default values are good enough? It would be good to have several acks from various projects or companies.
