Can you verify how many buffers you're allocating? I don't see how many
you're allocating in this thread.

On Tue, Mar 1, 2022 at 1:30 PM Lombardo, Ed <Ed.Lombardo@netscout.com>
wrote:

> Hi Stephen,
> The VM is configured to have 32 GB of memory.
> Will dpdk consume the 2GB of hugepage memory for the mbufs?
> I don't mind having less mbufs with mbuf size of 16K vs original mbuf size
> of 2K.
>
> Thanks,
> Ed
>
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Tuesday, March 1, 2022 2:57 PM
> To: Lombardo, Ed <Ed.Lombardo@netscout.com>
> Cc: users@dpdk.org
> Subject: Re: How to increase mbuf size in dpdk version 17.11
>
> External Email: This message originated outside of NETSCOUT. Do not click
> links or open attachments unless you recognize the sender and know the
> content is safe.
>
> On Tue, 1 Mar 2022 18:34:22 +0000
> "Lombardo, Ed" <Ed.Lombardo@netscout.com> wrote:
>
> > Hi,
> > I have an application built with dpdk 17.11.
> > During initialization I want to change the mbuf size from 2K to 16K.
> > I want to receive packet sizes of 8K or more in one mbuf.
> >
> > The VM running the application is configured to have 2G hugepages.
> >
> > I tried many things and I get an error when a packet arrives.
> >
> > I read online that there is #define DEFAULT_MBUF_DATA_SIZE that I
> changed from 2176 to ((2048*8)+128), where 128 is for headroom.
> > The call to rte_pktmbuf_pool_create() returns success with my changes.
> > From the rte_mempool_dump() - "rx_nombuf" - Total number of Rx mbuf
> allocation failures.  This value increments each time a packet arrives.
> >
> > Is there any reference document explaining what causes this error?
> > Is there a user guide I should follow to make the mbuf size change,
> starting with the hugepage value?
> >
> > Thanks,
> > Ed
>
> Did you check that you have enough memory in the system for the larger
> footprint?
> Using 16K per mbuf is going to cause lots of memory to be consumed.
>