Re: [dpdk-users] [dpdk-dev] time taken for allocation of mempool.

[Venumadhav Josyula <vjosyula@gmail.com>]

Hi Oliver,



*> Could you give some more details about you use case? (hugepage size,
number of objects, object size, additional mempool flags, ...)*

Ours in telecom product, we support multiple rats. Let us take example of
4G case where we act as an gtpu proxy.

·        Hugepage size :- 2 Mb

·        *rte_mempool_create in param*

o    { name=”gtpu-mem”,

o   n=1500000,

o   elt_size=224,

o   cache_size=0,

o   private_data_size=0,

o   mp_init=NULL,

o   mp_init_arg=NULL,

o   obj_init=NULL,

o   obj_init_arg=NULL,

o   socket_id=rte_socket_id(),

o   flags=MEMPOOL_F_SP_PUT }



*> Did you manage to reproduce it in a small test example? We could do some
profiling to investigate.*

No I would love to try that ? Are there examples ?



Thanks,

Regards,

Venu

On Wed, 13 Nov 2019 at 14:02, Olivier Matz <olivier.matz@6wind.com> wrote:

> Hi Venu,
>
> On Wed, Nov 13, 2019 at 10:42:07AM +0530, Venumadhav Josyula wrote:
> > Hi,
> >
> > Few more points
> >
> > Operating system  : Centos 7.6
> > Logging mechanism : syslog
> >
> > We have logged using syslog before the call and syslog after the call.
> >
> > Thanks & Regards
> > Venu
> >
> > On Wed, 13 Nov 2019 at 10:37, Venumadhav Josyula <vjosyula@gmail.com>
> wrote:
> >
> > > Hi ,
> > > We are using 'rte_mempool_create' for allocation of flow memory. This
> has
> > > been there for a while. We just migrated to dpdk-18.11 from
> dpdk-17.05. Now
> > > here is problem statement
> > >
> > > Problem statement :
> > > In new dpdk ( 18.11 ), the 'rte_mempool_create' take approximately ~4.4
> > > sec for allocation compared to older dpdk (17.05). We have som 8-9
> mempools
> > > for our entire product. We do upfront allocation for all of them ( i.e.
> > > when dpdk application is coming up). Our application is run to
> completion
> > > model.
> > >
> > > Questions:-
> > > i)  is that acceptable / has anybody seen such a thing ?
> > > ii) What has changed between two dpdk versions ( 18.11 v/s 17.05 ) from
> > > memory perspective ?
>
> Could you give some more details about you use case? (hugepage size, number
> of objects, object size, additional mempool flags, ...)
>
> Did you manage to reproduce it in a small test example? We could do some
> profiling to investigate.
>
> Thanks for the feedback.
> Olivier
>