Re: [dpdk-users] DPDK 17.11.2 - PMD: net_mlx5: mempool 0x7fc988c33e40: not virtually contiguous

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 8 Aug 2018 09:37:10 -0700
Anshu Boonapalli <anshu.boonapalli@gmail.com> wrote:

> The system i am working on has ~1TB of RAM.
> 
> On Tue, Aug 7, 2018 at 9:28 PM Singh, Satish 1. (Nokia - IN/Bangalore) <
> satish.1.singh@nokia.com> wrote:  
> 
> > Hi,
> >
> > According to your configuration, yiu are allocation 80K*2MB = 160GB of
> > memory, do you have that much Ram in your system?
> >
> > Regards,
> > SATISH SINGH
> >
> > -----Original Message-----
> > From: users <users-bounces@dpdk.org> On Behalf Of Anshu Boonapalli
> > Sent: Tuesday, August 7, 2018 10:33 PM
> > To: users@dpdk.org
> > Subject: [dpdk-users] DPDK 17.11.2 - PMD: net_mlx5: mempool
> > 0x7fc988c33e40: not virtually contiguous
> >
> > hi,
> >
> > I am facing this failure intermittently during the rte_eal_init call, when
> > using relatively large number of hugepages (~80k+ of 2MB hugepages).
> >
> > The mempool for this scenario is allocated using rte_mempool_create() and
> > all associated documentation/source seems to indicate the pool returned
> > should be virtually contiguous.
> >
> > Have any of you experienced this failure and figured out a resolution?
> >
> > Thanks,
> > -Anshu
> >  

With lots of memory you are going to overwhelm the IOMMU with 2M pages.
Better to use 1G huge pages.