Than you so much Jayakumar for your help. Quick note. In the document you pointed It states that
"Enqueuing and dequeuing items from an rte_ring using the rings-based PMD may be slower than using the native rings API. This is because Intel? DPDK Ethernet drivers make use of function pointers to call the appropriate enqueue or dequeue functions, while the rte_ring specific functions are direct function calls in the code and are often inlined by the compiler." Is that statement correct ? I would imagine that inlined code would be be faster than using function pointers ? Also what are the native apis ? it does not make it very clear. could you make it clear what is referrend as "native rings API" ? On Fri, Feb 14, 2014 at 1:20 PM, Jayakumar, Muthurajan < muthurajan.jayakumar at intel.com> wrote: > Can you please refer Chapter 15.1.2 of the programmer's manual > http://www.intel.com/content/dam/www/public/us/en/documents/guides/intel-dpdk-programmers-guide.pdftitled > "Rings-based PMD". > It indicates that " To run an Intel(r) DPDK application on a machine > without any Ethernet devices, a pair of ring-based rte_ethdevs can be used > as below" > As Vivek indicated, the ring based PMD (libte_pmd_ring) allows a set of > s/w FIFOs (that is rte_ring) to be accessed using the PMD APIs, as though > they were physical NICs" > > -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Ymo Lists > Sent: Friday, February 14, 2014 9:20 AM > Cc: dev at dpdk.org > Subject: Re: [dpdk-dev] Is it possible to have dpdk running with no > dependency on a nic ? > > Could you please point me to a sample doing this ? All the sample i have > seen are initializing the eal and that involves initializing the nics. Is > there a sample ? Can you mock up some code ? > > plz plzzz :-) > > > On Fri, Feb 14, 2014 at 3:42 AM, Vivek Soni <tellviveks at gmail.com> wrote: > > > Yes, It is very well possible to run DPDK without dependency on the NIC. > > But it all depends what you want to do. > > The two DPDK applications can communicate using the ring library > > provided by DPDK. In case there is no NIC, DPDK provides pure software > > based PMDs which can be used on systems without a NIC or with > > unsupported NIC using standard kernel drivers. > > > > Hope it helps. > > > > Regards, > > Vivek > > > > > > On Fri, Feb 14, 2014 at 1:49 AM, Ymo Lists <ymolists at gmail.com> wrote: > > > > > Is this a faq ??? > > > > > > > > > On Wed, Feb 12, 2014 at 1:21 PM, Ymo Lists <ymolists at gmail.com> wrote: > > > > > > > 1) I have two apps that need to communicate on the same machine . > > > > Is it possible to have these two apps communicating via dpdk > > > > without > > > referencing > > > > a nic ? > > > > > > > > 2) The apps need to run on an amazon vm. How can you run dpdk on > > > > an > > > amazon > > > > vm with only one nic if the above is not possible ? > > > > > > > > > >
